there are a lot of things to do about this...
- make shure you aren't "flailing" the more precise you are with your swing and punches the better the wii will pick up on your movement
- wii isnt made for "ali" you cant fly like a buterfly n sting like a bee my man... keep your feet planted and take precise thought out punches
- the more technical you are with your movements the better... i cant stress how useless it is to just punch like crazy n throw your arms all over... it really wont help you win. i promise. keep planted and watch for open body and head shots when you see em use quick precise jab motions. the wii will pick up on you and you'll get the heavyweight belt lol