The drill is done in a very relaxed manner similar to what you would do when first warming up so technique is not important. I also do not let them get into a set position for the slingshot or full motion, it's not pitching. I want it as free form as possible, I want them to explore and be creative, find new patterns. Keeping the tempo slow and easy allows them to feel the way they move.That would only work if they throw overhand correctly no? Which is a big if..Or is the feel of an incorrect OH throwing pattern still good enough for this purpose?