Yes, yoga will definitely help, but I'm not sure about the p90x version of it. Well anyway, what we mean by when enhancing flexibility you do not want to reduce elasticity, it's like a rubber band. You have a long and thin one and a short and thick one. What's the difference? The long and thin one is very flexible, but has very little elasticity, and the short and thick one is the opposite. Obviously, which can shoot further? They can shoot about the same distance, because flexibility helps with the stretchiness and elasticity helps with snappiness. So in this case, enhancing flexibility while enhancing elasticity is like a long and thick rubber band. This is the one that can usually go the furthest. Sorry for the long explanation, but this is pretty much it ;).