I don't know what techniques schools are using, but here is an interesting article on LSU and how they use a new device to measure velocity training in weight lifting. Probably old to you guys, but new to me...
www.wsj.com
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LSU Is Winning the Weight-Room Arms Race With Real-Time Data
LSU’s football success may be partly owed to a technological advance and a partnership with fitness startup Perch.
Note: subscription required to read the entire article.