Whole body exercise and explosiveness... that's the ticket.

Heave around those bags of chicken feed, Arlen, or go down to the hardware store and buy a 50 lb bag of sand and wrap the dickens out of it with duct tape. Lift that, a lot.

Put that 50 lb bag of whatever on a sled of plywood and drag it all over the football field. Run stadium steps with it.

Make implements and throw with them, throw a LOT.

Look at ebay videos until you're crosseyed. but mostly, I am learning....throw.

throw a LOT, and throw with guys (or gals) who are better than you are.

And for heavens sake, have fun!!!