Well, let me give you the cold hard facts… It doesn’t exist. Especially not with young athletes.
When working with preadolescent and high school athletes, the undeniable reality is that we are tending to an organism that is in the process of growth. And that fact is something that we cannot do anything about, nor cause disruption to the process of.
What a growing and maturing body needs in order to remain injury-free and develop optimal athletic skill is variety. With respect to training, this amounts to NOT having a hyper-focus on making a young athlete a better football player by only doing exercises in the gym that the NFL players would do.