Evidence of the Buhlman Sports Activities is everywhere.

Bill, your heart rates about 130 to 130.

Dr. Kenneth Cooper is founder and director of the aerobic center in Dallas, Texas.

Over the past two decades, the use of exercise to help prevent cardiovascular disease has been in a state of transition

from unfounded fatties of the scientific legitimacy.

Our goal has been to help that transition, and our basic hypothesis is very simple.

A carefully planned and executed exercise program is an important aspect of preventive medicine.

We found that fitness level was the single best predictor of heart disease.

Let's look on the vector forces now at the race and at the elbow in the shoulder.

Dr. Gideon Ariel, director of research at the Kota Research Center near Los Angeles.

Dr. Ariel has spent the last decade developing computerized techniques called computerized biomechanical analysis

to quantify human movement.

Let's go forth, friend.

The design computer programs analyze velocities, accelerations, and other forces that coaches

and diagnosticians can neither see nor assess.

Dr. Ariel and his colleague Ann Penny take high-speed films of a Bobby in motion.

The individual images are then traced into the computer as stick figures, one frame at a time.

Biomechanical principles developed here can be applied to anyone performing any activity

to optimize movement and to minimize the risk of injury or re-injury.

Here is an ideal volleyball spike.

Notice how the force vectors at the joints are parallel as the arm moves toward impact.

Everything is in the proper direction.

Now here's a player with tennis elbow, even though she played volleyball.

The slightest pain will change the pattern of motion.

The force vectors in this person are in a non-parallel orientation.

That creates a sheer force on the elbow which is a single-plane joint and cannot pass any of the shock along.

It generates as much as a hundred times the force of throwing something.

This patient's problem will be treated medically.

Before she returns to play, she will be prescribed a graduated series of forearm strengthening exercises.

The goal is to tailor a conditioning program to the individual that will create a training effect

without the adverse consequences of overuse.