Sports Science

Wednesday, December 8th, 2010

Paradox #14 Do you roll over the ball to hit topspin?

You hear it all the time. It comes from amateurs at public courts, who unfortunately may not know any better. But when highly paid television commentators talk about it, I get kind of sick. After all, the ball is only in contact with the strings for 1/1,000th to 3/1,000th of a second. Yes, that’s milliseconds. How fast is a millisecond? To give you a comparison, a regular light bulb cycles at 1/60th of a second. So, a ball is in contact with the strings and leaves the strings at least 20 times faster than the flicker of a light bulb (which the human eye cannot detect). After all, when we look at a light bulb we only see a steady stream of light.

So, considering the brevity of the event we call ball contact, how can a player possibly “roll over” a ball to create topspin? The fact is that they can’t. Three things affect spin and arc (or trajectory).

1)      The angle of the incoming ball

2)      The angle of the racquet face at contact

3)      The path of the racquet face during that brief moment we call contact

As much as I am a fan of many of television’s tennis commentators, I hope at least one of them will read this blog and stop perpetuating mis-information like this that slows down the improvement of many tennis players.

What does create topspin? Take a look at one of the YouTube clips on this webpage to get a good visual reference.

Monday, September 20th, 2010

Paradox #11 Do muscles have memory?

People speak of “muscle memory” and so commonly use it as a figure of speech, it’s accepted as fact. But the problem with thinking in terms of muscle memory is that it can overshadow the importance of understanding the basics of how and when neuro pathways in motor sports (specifically tennis) are best established.

Admittedly, motor skill development and human neurology are enormous fields of study and are frontiers continuing to be explored. While there is so much that scientists have learned about brain function in recent years, the overall complexity of neuro pathway functionality is still daunting. For the purpose of this blog, we will keep it relatively simple and address some basic examples as they apply to how parents can help their children, as well as how players can help themselves improve their tennis.

First, do muscles actually have memory?  Not in the traditional sense. It’s more like a computer being programmed. Interestingly, the common word for storage capacity in a computer is also “memory.” Human brain learning memory in the traditional sense is different than muscle memory. We can cram for a test and then forget what we studied a week later. Otherwise, the word “forget” would not be in the dictionary. 

So, once a muscle learns a specific task, does it ever forget? Not really. Try this exercise. Sit in a chair. Cross your arms. Make note of how comfortable that position feels since you have neuro pathways etched into your system to make that specific movement feel natural. Now, uncross your arms and then quickly try to cross them in the opposite direction. Chances are you will feel very awkward and perhaps can’t figure out how to do it at all.  This arm crossing is just one example of thousands of specific daily movements that we do every day without thinking. They are automatic and chances are that even if you didn’t do one of them for a few years, you would retain the neuro pathways for that skill.

 If you want to read a little more, including the differences between the ease of learning motor skills while young or when a person is older, here’s an article of interest.

Tuesday, August 24th, 2010

Paradox #9 Can a player move fast and be economical with movement?

I was shocked to recently read that junior athletes in all sports have a 41% chance of experiencing at least one injury related to their sport. In tennis, primary injuries are from the lower extremities, with feet, ankles, and knees leading the list.

Yes, we all know that hard courts can be a big culprit, but to lower the risk of injury is it also possible to be extra light on your feet with fewer steps and also be quick? So many pros and coaches teach footwork intensity but how many are teaching young players to be extra light on their feet? Watch how some players on the pro tour move with grace and apparent relaxation, while others seem almost frenetic in their bounciness. They almost look like jackhammers chipping away at concrete; in this case,  pounding away knee cartilage with every bounce. 

Do any of you remember Andre Agassi’s change in movement when he came back for his last effort on the men’s tour in 2006? After each groundstroke, he would recover, and then literally stand still and appear flat-footed waiting for his opponent to hit the next shot. Clearly, he was trying to avoid stress and strain on his back by being economical with his steps. However, he was also getting to his shots very well and didn’t appear handicapped by this approach. In fact, he played very well.

Another great little story happened at a tennis teacher convention in Phoenix nearly 10 years ago. 12-time Grand Slam Champion Roy Emerson was playing a doubles exhibition with some top-playing and much younger teaching pros. Emerson must have been in his mid to late 60s at the time, with admittedly worn out knees from decades of competition. Sadly, like so many of us, he really could not run. He didn’t even appear to try. No split step whatsoever. BUT… he got to every ball early and outplayed those top ranked Arizona pros who could have been his grandkids. His secret? He had very good balance and was leaning on his heels at the wrong time. Obviously he also has well-developed anticipation skills.

Now, Agassi and Emerson were moving less because of injury and age. But how about moving less to avoid injury? And, moving smarter to play your best at the same time. After all, it’s absolutely true that effective movement and balance are essential to play tennis well. Learning forwards into a good playing height will take players off their heels and get them moving better. Here’s a fun and effective tool to get players off their heels and moving better in a matter of seconds.

Tuesday, June 29th, 2010

Paradox #6 Can a player move fast and be economical with movement?

I was shocked to recently read that junior athletes in all sports have a 41% chance of experiencing at least one injury related to their sport. In tennis, primary injuries are from the lower extremities, with feet, ankles, and knees leading the list.

Yes, we all know that hard courts can be a big culprit, but to lower the risk of injury is it also possible to be extra light on your feet with fewer steps and also be quick? So many pros and coaches teach footwork intensity but how many are teaching young players to be extra light on their feet? Watch how some players on the pro tour move with grace and apparent relaxation, while others seem almost frenetic in their bounciness, so much so that they appear to be pounding away knee cartilage with every bounce. 

Do any of you remember Andre Agassi’s change in movement when he came back for his last effort on the men’s tour in 2006? After each groundstroke, he would recover, and then literally stand still and appear flat-footed waiting for his opponent to hit the next shot. Clearly, he was trying to avoid stress and strain on his back by being economical with his steps. However, he was also getting to his shots very well and was not handicapped by this approach. In fact, he played very well.

Another great little story happened at a tennis teacher convention in Phoenix nearly 10 years ago. 12-time Grand Slam Champion Roy Emerson was playing a doubles exhibition with some top-playing and much younger teaching pros. Emerson must have been in his mid to late 60s at the time, with admittedly worn out knees from decades of competition. Sadly, like so many of us, he really could not run. He didn’t even appear to try. No split step whatsoever. BUT… he got to every ball early and outplayed those top ranked Arizona pros who could have been his grandkids. His secret? It’s called anticipation and is another ingredient of efficient and effective movement. Agassi and Emerson were moving less because of injury and age. But how about moving less to avoid injury? To read more on lighter footwork to minimize the risk of injury, you may want to read this article.

Wednesday, April 29th, 2009

Tips on Managing Stress

Tip #1: Dr. Jim Loehr recently offered a graphic example of the importance of rituals during a NASA spacecraft launch.  Think about it.  NASA has an incredibly elaborate countdown and checklist to prepare for each launch.  Similarly, a world-class performer or coach has an equally elaborate series of rituals leading to that ideal performance state.

Tip #2: Jim described mental toughness as containing the following two qualities which move a person’s emotions: Positive thinking and imaging, and positive acting.

Tip #3: As far as stress is concerned, he provided an interesting perspective by describing that to become a world-class athlete or coach, we must each take on stress.  And, specifically as coaches, we must also administer stress.  The best coaches administer stress perfectly according to each player’s needs. 

Tip #4: As far as recovery is concerned, Jim explained that recovery is relative to the stress that one faces, and that it has to be equally strong and effective as the initial stress in order to be effective.  There are two types of recovery that he described: One is called “active rest” which would include engaging in activities that are both relaxing and recovery-oriented yet active at the same time.  Examples of this would include cycling for fun, jogging for fun, or going for long walks.  The second category is called “passive rest” which would include reading a good book or going to the movies.

Friday, March 27th, 2009

The Semi-Open Stance

The biomechanical benefits of the semi-open stance have been long discussed and documented.  Since body rotation is one of the keys to efficient stroke production, comparing groundstroke stances and rotation clearly indicates that a semi-open stance allows the body to coil and uncoil in one continuous motion, as it also achieves sufficient forward weight transfer.

And, since there are different body sections that coil and uncoil (hips, torso, shoulders, etc.), coaches and players need to also be aware that these rotational components occur with one lagging behind the other.  In other words, the hip rotation lags behind the knee rotation and the torso rotation lags behind the hip rotation, etc.  And, as one goes up the kinetic chain each of these segments accelerates faster than the previous segment.  A good metaphor is to consider racquet head speed like the cracking of a whip when the stroke is executed with the proper biomechanics.

Friday, February 27th, 2009

Running and Tennis









Carl Lewis, the famous sprinter, spent hours upon hours training to move his body from point A to point B as quickly as possible. He worked on his starting movements, his stride-length ratio, and even the angle of his body lean at the finish line; his goal was to cover the race distance faster than anyone else. Compare the performance requirements demanded of Carl Lewis with someone like Pete Sampras. As you probably recall, Sampras was well known for hitting incredible forehands on the dead run. Sampras and Carl Lewis are not very different at all except that Carl Lewis did not have to hit a forehand at the end of his run. This should make us respect Sampras’ athletic ability even more, plus appreciate some of the special challenges that tennis uniquely offers. 

This is especially true since tennis is an open skill sport, meaning that it is played in an unpredictable environment.  This makes it very different from track, for example, which is understood to be a largely closed skill event, since the environment is almost completely predictable.  This is another thing that makes tennis so challenging as well as stimulating.









Wednesday, February 4th, 2009

Dr Jim Loehr Tips on Recovery



Tip #1: Dr. Loehr describes stress as the stimulus for growth but also emphasizes that it is during recovery that actual growth takes place. Therefore, stress alone yields no growth and recovery alone is also ineffective in producing growth. It is the combination of stress and then the recovery period afterwards, which allows one to grow in whatever activity they are pursuing.

Tip #2: There are 7 mechanisms for recovery:
a. sleep
b. good nutrition
c. exercise
d. humor
e. active and passive rest
f. need fulfillment
g. social interation

Tip #3: What is the connection between sleep and fitness? Firstly he explains that the more fit a person is, the less sleep they need. Then he went on to share the discovery that the first 90 minutes, known as “slow wave sleep,” is the most essential portion of a good night’s rest.

Tip #4: He also described that humor is a serious thing and a key aspect of being a good coach.  He described that a useful sense of humor has nothing to do with the ability to tell jokes.  Good humor is the ability to laugh in the face of adversity and stress. 

Tip #5: The final point we want to share is the principle of oscillation.  Dr. Loehr explains that oscillation is critical to balance.  In the context of his presentation, he describes the principle of oscillating stress and recovery.  If one fails to oscillate or experiences what he calls “oscillation failure,” the result will probably be overall failure in whatever activity one pursues. Neither all stress nor all recovery is healthy.

Tuesday, December 16th, 2008

The Role of the Arm and Relaxation in Tennis





It’s been explained that, “the arm does not generate force; it transfers force.”  Therefore the arm itself should always be seen as one of the last links in the kinetic chain rather than the origin of the force hitting a tennis ball.  Many think that the racquet is a passenger in the vehicle and is just along for the ride.

A key to keeping the arm as a transfer of force is to keep it relaxed. And without a doubt, the key to maintaining a relaxed arm is to keep the fingers on the grip relaxed.  One of the best ways to learn how to relax your grip is to try our new cutting edge training aid, the Grip Loose. Click here to find out more…





Tuesday, November 25th, 2008

Tips from Dr. Jim Loehr on rituals

According to well-respected sports scientist, Dr. Jim Loehr, world-class rituals or patterns of behavior are as required to maintain a successful career in coaching as they are to compete successfully as a world-class player.  He advises that we should think of rituals as anchors to our identities as a person.  Rituals, when correctly practiced, will yield the following results: rituals increase personal control, rituals create rhythm and meaning in our lives, rituals express who we are, rituals reflect a person’s deepest values.

Then he explained that the most important rituals are connected to the following twelve activities:
1. Sleep – by regulating one’s hours of sleep.
2. Exercise – he commented that the afternoon times are best because not only is exercise good for overall well-being, but it is a good stress-reliever.  By the time the afternoon rolls around, one’s stress level is built up and exercise serves a double function of both developing fitness and relieving stress.  However, he cautioned the audience that if one exercises too late at night, that it can inhibit one’s ability to go to sleep easily. 
3. Nutritionally speaking, he recommended small meals to maintain a proper balance of blood sugar throughout the day.  Additional he commented that breakfast, which balances the blood sugar level immediately after waking up, is also critical.  Too many people say they have no time for breakfast.
4. Family time on a scheduled, regular basis was also stressed as important.
5. Spiritual rituals were also emphasized as important depending on one’s own personal beliefs and practices. 
6. Pre-performance rituals would include the types of meals one eats and how they prepare for a day’s work or an important meeting. 
7. Travel rituals would include how one adjusts to new time zones or minimizes stress before and after traveling.
8. Telephone rituals deal with balancing the stress of the often overwhelming hours of telephoning which is required of coaches.
9. Office recovery has to do with coping with the stress of an office environment, particularly for the coaches who are not office-oriented.
10. Creative rituals reconfirm that everyone has a creative side and this side must be nurtured by each person. 
11. Home recovery was explained by Jim as connecting the quality of one’s own private personal time and one’s shared family time.  And, finally,
12. Time alone rituals – He asked the audience of more than 200 coaches how important time alone was to each of them, and this was one area which received almost 100% unanimous confirmation.

Tuesday, October 28th, 2008

Mental Toughness for the Teaching Pro

To bring home the importance of stress management, Jim believes that the tennis coach needs to perform the remarkably challenging task of career coaching for themselves.  In other words, coaching a sport like tennis require long hours and coping with tremendous stress. He asked the audience of coaches to both visualize and feel the stress of the long hours demanded by their career.  Then he asked everyone to imagine themselves bearing this responsibility for twenty or thirty or even forty years.  Incredible! 

Then Jim asked a more narrow-focus question to the coaches in attendance: “How do you get your best players to evolve and handle the stress and strain of competition.”  The obvious answer came forward: through proper training.  Well, according to Jim, coaches must train also.  In fact, from this perspective, it is even more important for coaches to train than for players since their careers in coaching are many times longer than the relatively short career of competitive play.  He also commented that the biggest role of a coach is to be the “mover” and “shaker” of someone else’s emotions.

He then moved on to describe strength as the ability to both exert strength and resist strength.  Resisting strength means maintaining balance and your own ideal performance state despite negative outside forces.  And, as far as exerting one’s own strength, this is best accomplished when living in the ideal performance state which he describes in twelve words: Relaxed, calm, anxiety-free, high-energy, positive, enjoyable, effortless, automatic, confident, alert, in control, and focused.

Friday, September 26th, 2008

5 Tips from Vic Braden

5 Tips from Vic Braden

Tip #1: Regarding serving, coaching legend Vic Braden has recently explained that the racquet head will accelerate 1.7 times as fast when the non-racquet hand drops and blocks the body as compared to when it simply swings to the opposite side of the body. Now the question is whether players can learn this motion of snapping and blocking. Vic joked in his usual hilarious manner that the only time he’s seen this type of snapping and blocking motion was in Junior High School in the boys’ locker room when they learned to snap towels at their fellow students as they would come out of the showers.

Tip #2: According to Vic’s studies, the back scratch position for starting the serve is completely antiquated and should not be taught any longer.  Efficient acceleration of the racquet head becomes lost when the linkage process is limited to starting in the back scratch position.

Tip #3: He also shared some opinions on gross motor-skilled players versus fine motored-skilled players.  Although a combination of both of these skills is required for tennis, he shared his observation that many recreational players tend to be predominantly one way or the other.  For example, gross motor-skilled players will typically have longer swings with stable racquet heads.  On the other hand, fine motor-skilled players are often the people who quickly roll their wrists.  These people should be strongly encouraged to lengthen their swings and have as stable a racquet head as possible.

Tip #4: Regarding brain typing, Vic pointed out some overall patterns by explaining that some people are extremely focused and can only handle one point of information at a time.  Others, however, are naturally multi-task oriented and want to receive a lot of information at once.  To illustrate the point, Vic described a multi-task oriented mother who came home to her single-point oriented son.  First she asked him if anyone called when she was gone.  He thought about it and said: “Yes.”  She waited for him to continue, but when he didn’t, she then asked: “Well, who called?”  He quickly said: “The real estate agent.”  Then again she waited for him to continue.  Again he didn’t.  So she asked impatiently: “Well, what did he say?”  The son then answered: “Someone wanted to see our house since it is up for sale.”  Then the mother quickly said after the son seemed to end his sentence, “Well … when?  What time are they coming?”  The son said: “Oh, in about an hour.”  This funny story illustrates very clearly how communications can break down between multi-task and single-point oriented people and that coaches should be careful to recognize which type of person they are instructing and adapt to that individual.

Tip #5: According to Vic, great players plan practices intelligently, practice intelligently, and play how they plan.

Tuesday, September 2nd, 2008

Movement Training and Stretching

Many coaches are getting away from jump ropes totally in terms of movement training for tennis. Rather, they focus more on other tennis-related movement exercises, even incorporating shadow swinging. And, as far as stretching is concerned, many leading coaches and trainers are now advocating minimal stretching before playing. The old-school on stretching would have players stretch out completely before competition. Consider a pre-match stretch to last just a few minutes at most.

Thursday, May 29th, 2008

Eight Characteristics of High Profile People

Here are eight characteristics of high profile people that without a doubt include tennis professionals and coaches, as well as respected and successful career competitors:

1. They are giving, caring, and passionate people.
2. They are optimistic and pro-active.
3. They are energetic, enthusiastic and motivated.
4. They are well organized.
5. They are happy, fun, and humorous.
6. They are always good communicators.
7. They are adaptable and innovative.
8. They strive to be healthy.

Wednesday, April 23rd, 2008

Physiology can change Psychology

For the coach, the player, or the parent, here’s a tip worth remembering. There are four ways to change our psychology through changing our physiology:

1. Stand up straight.
2. Put a positive look on your face.
3. Have only positive things come out of your mouth.
4. Speak positively about yourself and to yourself.