Try not using so many words. Try-"No hitting!!!" Then set a timer for 2 minutes and have him sit somwhere off to the side. Then when the timer goes off, say again something like-"You do not hit!!! Then, "Go play, and he'll try it again. Also, while he is in time out don't speak to him. Wait til the timer goes off, they be brief. Less is more. Also, be consistant-so he knows exactly what to expect, and not feeling that sometimes he gets away with it , so he'll just always try. It's tough in the beginning because you will feel like you are doing this alot, but give it a little time-Alyssa. You will see improvement, and understanding