I've see some discussion about the pros and cons of pitching with weighted balls. DD(14yr old) has been seeing same pitching coach for almost 4 yrs, every winter we pitch with a weighted ball. The first 3 yrs we pitched with a 16oz ball, currently we are pitching with a 20oz ball(homemade, but weighed on postal scales). When I say pitching, I mean 43', all out pitching. We have seen a decent increase in speed each year, last spring she was consistently in the 56 to 58 mph range during games. We take longer to warm up and throw fewer pitches than a normal lesson, and usually only pitch 1, or maybe 2 other times per week. She has never experienced any soreness problems or injuries, I'm sure others have had different experiences but DD has had no problems. We start out throwing about 50 pitches(fastball only) per lesson and progress up to 90 to 100. The instructor is a former male fp pitcher and has several students that have played and are playing D1 and D2. He teaches 12-6 spin on fastball and really pushes girls to pitch as hard as possible. I'm thinking that next winter will be spent working on riseball, so no more weighted balls. I just wanted to hear from some others about their experience or thoughts on weighted ball pitching.