Have a HS senior here. His pitching coaches emphasize mechanics and command, and have told him that velo will come along naturally as he matures, and he has 100% bought into it. He knows guys who have done the veto programs and a couple have, unfortunately, blown out their UCL's. One just happened a few weeks ago to a kid (junior) who was touching 90 as a sophomore. Some of the dads at our boys' game yesterday were talking about this young man and said that he would pitch in 2-3 games a weekend in middle school. Yeeeesh. A kid our son got to know over the years was used/abused like this and didn't have an arm left to make his mediocre high school team as a senior this season. He pitched against us last season and was "washed up." Oddly enough, his father is a medical doctor.