Workout regimens come and go as fads, changing in popularity every year. The ancient practice of yoga, however, is just as popular now as it was years ago. The benefits of yoga reach far beyond improving flexibility and can significantly improve performance for the better.
If skeletal muscle is the organ of movement, then muscle flexibility is its base for function. Without range of movement (as athletes know too well) strength and power amount to very little. Lack of flexibility also leads to muscle stiffness and soreness.