You can also get an inexpensive TENS unit that stimulates your muscles. Mine is Prospera brand, and can use either two or four adhesive pads and several stimulation profiles. I can set it anywhere from a faint tickle to taser (almost) and can use the pads several times before they don't stick well enough. Replacement pads are cheap.
My wife bought one of those off Amazon. I was skeptical at first but they do really work well.
