My son has always been one of the hardest throwers in his age group, he's thrown 82 recently as a 14 yr old 8th grader. Our future high school pitching coach reached out to us when he heard we were going to attend his school next year and invited my son to do a weighted ball workout that he's been doing with his high school and travel team pitcher during the month of Dec and Jan. Ill let you know how it goes, its been tough to stay on program we seem to miss 1 or 2 day every week for 1 reason or another but I think its helping. at a minimum it seems hes getting his arm in shape for the spring season about to start down here in Texas like tomorrow. It was interesting when coach pulled out the radar the other day and was getting times for every color ball the intensity really picked up. Everyone complained of being sore the next day, as an aside from a different thread I picked up a marc pro on ebay for about 1/2 cost of a new one and my son used it that night and was only kid the next day that was not sore.