Don't really agree with some things here, which is my perogative, unless your kids got some rocky mountain high going, 13 years olds may have begun the puberty process but no where near it.
My son left HS with some chin hairs going on, he was touching 91. His biggest years in maturity growth was in college, and he only left with hitting 94, but by 29 he was hitting 96.
What would you suppose was the reason for that?
I have no issue with teaching kids to throw hard, but bottom line is very few will be throwing 90 or plus their senior year.
How often do you guys put the gun on your kids?