Not to mention the bicep muscles are going to be stronger and easier to do the vibration with than ANY muscle in your hands. At least, that's the way I figured

Not to mention the bicep muscles are going to be stronger and easier to do the vibration with than ANY muscle in your hands. At least, that's the way I figured it out-- by locking my hand and lower arm muscles tight, then using the strongest muscle in my arms (the biceps) to do the actual work.