I think all athletes benefit from and need training. That being said, the trend today is towards gross over training. So many guys put large volume loads on their athletes. Very few sports benefit from this type of training in my opinion. That being said, complete over training of the CNS is rare and usually only seen in extremely powerful and fast athletes. If you do hit that point, it can take months to get right, not weeks or days. I know guys who have trained so intensely they have gotten rhabdomyolysis. Kiss of death to an athlete. it all comes down to understanding what is proper stimulus. My philosophy is do enough to elicit a super compensation, but always at a recoverable level. The thing I see so often is trying to ride the razors edge and ending up trashing the athlete. It is much like the axiom in the financial world. " Pigs get fat and Hogs get slaughtered". Trying to get to greedy with the gains. Charlie once told me that you can not possibly move forward in all facets of your training at the same time. When pushing max strength, dial down speed or another variable. Athletes are created over years, not over night.