There are apparently people who don't like the towel drill, but I've found it has helped my son. He works with Paul Reddick, who co-authored "The Picture Perfect Pitcher" with Tom House, a big proponent of the drill. My son has definitely benefitted from the emphasis of the linear extension toward the plate, and after watching the video of the UVA pitching coach discussed here, I'd say it is hard to argue with the success he has had in avoiding injuries.