Well, actually not an impact bag, I got a golf cart tire/rim. I took it outside and started whacking it. Flat left wrist, bent right wrist. A nice 'thud'. this would slide the tire along the ground a little. I would even say that it teaches 'heavy hands' thru the ball. Is this all I need to do? I think if i smack it about 100 times a day for the rest of the summer, I may be getting somewhere. Are there any drills or just keep hitting it?