Wog thats another topic of contention these kids shouldn"t put a finger on a weight until the growth plate has fused. Not just because its unsafe, primarily because of the lack of supervision and the obvious fact that kids this age tend to showoff which leads to attempting too much weight which inturn increases the risk of injury. My older boy flirted with 90 last summer my younger boy 2010 hits the low 80's both look like they lift weights but never have all plyo, med ball, isometrics and pushups etc, they have three pitches 2 and 4 seem and a change. Both have never attempted a breaking ball and neither will be allowed until college. Coaches that introduce this stuff be it hs or travel are doing your kid a diservice.