M.R.
Use the Shake Weight while wearing your Shape Ups, doing your acai berry colon cleanse and voila!
Just kidding.
The shake weight is yet another gimmick for people to waste their money on. You don't have to spend any money on anything if you want to tone your biceps, triceps, deltoids, pectorals, trapezius, and rhomboids. It's called push-ups! They'll hit every muscle listed AND you don't have to spend a dime! If you can't do regular push-ups, start by doing a push up on the wall. Once that becomes more comfortable, move your feet farther away from the wall to make it harder. Next up - do your push-ups on a step. Finally, do push-ups on your knees or full pushups. Same goes for dips - you can do them on a chair or on a step.
Don't like push-ups? No problem. Go to Dick's Sporting Goods or Play It Again Sports and get a pair of 5 pound and 8 pound weights. Do bicep curls, tricep extensions, front raises, lateral raises, shoulder presses, etc.
The Shake Weight is garbage. Skip it.