By stalin

Imbalances may occur from sport, exercise, occupation, and even heredity. You may have developed pain in the shoulder from being a tennis player. Tennis players tend to develop too much shoulder rotation in one direction while losing shoulder rotation in the other (sport imbalance). This may lead to instability and the development of trigger points in the shoulder. You may have developed low back pain from doing to many sit ups that tighten up your hip flexors and increase your hip flexor strength relative to your abs (exercise imbalance). The pain in your low back may have been from a leg length discrepancy you were born with (hereditary imbalance).