Got the Ball Stomp'r in the mail today. Thank you Kfamr. My dog Baxter couldn't figure it out at first. I stomped on the ball stompr & Baxter didn't see the ball go flying. Then he was standing there & the ball flew up & he ducked. Then after about 10 times of stomping the ball he caught on & he really got into it. He loves to catch high flys. Anyhow it sure does same on my pitching arm & it is actually good exercise for the legs. The Ball Stomp'r came with a tennis ball besides. Oh Happy Day for my doggies Bob, Baxter, & Max ( my grandpuppy)