Playing a single sport and training sports specific is the quickest way to lead to an overuse injury. You are seeing this happen more and more in sports like baseball with oblique injuries. This is why GPP (General Purpose Physical) training in the off season produces tremendous results later during sport specific training. The gains in baseline strength and efficient movement at speed with a high heart rate create a foundation that the athlete can build on while developing fine motor skills specific to their sport.
We have trained high school, collegiate and Professional level athletes in baseball, softball, football, swimming, tennis, volleyball and cross country. We do modify many of our programs to help prepare specific areas of interest for a impact sport vs and endurance sport, but our core belief remains the same; developing the athlete to their true genetic potential will get them further to their sports goals.