Been reading a number of articles and books recently on the topic of biomechanics and sports injury. One of the authors made an interesting assertion which has some real merit when it comes to tennis training. He talked about the pollution of Western sports training by the techniques of body building. Where the Eastern Europeans and Russians focused on training the whole kinetic chains involved in an activity, i.e. the service motion or slap shot, Western training was taken over by the concepts of body building, ala isolating muscles, whose main purpose is hypertrophy. His argument was that the increase in injuries we are seeing in athletes of all skill levels comes from the imbalances created by their use of isolation training and hypertrophy techniques (body building), instead of building strength across the entire kinetic movement. Something to think about the next time you are looking to improve your serve and your personal trainer (or a TW board member), recommends you do lateral raises to strengthen your shoulder. A better approach would be to find exercises than engage the entire service kinetic chain, i.e. legs, hips, trunk, shoulder and arm at the same time. Plyometric exercises that challenge the service kinetic chain might be the better approach. Among the many great points he made was that the majority of advice dispensed in gyms has absolutely no basis in fact. As an example, we are told to exhale when exerting, inhale when recovering while lifting weights Yet there is not one scientific study that says this provides any benefit during the actual performance of an athletic activity. Not a single one. Good stuff and worth thinking about as you craft your training routine. I definitely plan to research further. I've already adopted some of his principles and seen a drop off in pain, shortening of recovery times and increases in stamina and strength on the court.