Muscular Balance Reduces Injuries

Having proper muscular balance can help you reduce avoid injuries; otherwise, the compensation causes an injury. Exercises that hypertrain one part of the body, throw the change the body's muscular balance. Take a conventional squat for example, it hypertrains the quadriceps. This causes your body to out of balance and not work as efficiently. Think of your quads and hamstrings like scissors for a moment. If you shorten one of the blades, it does not work nearly as efficiently. It's a crude analogy, but you get the idea that muscular balance is extremely important.
Two effective ways to work your legs is with kickbacks on an exercise ball and using an Accelerating Isokinetic Machine. These exercises work the stretch relationship between the hamstring and the opposing quads. These exercises help your legs find their maximal stretch range, and you typically can avoid conventional hamstring tears.