I be just a average 44 year old with age arm and the Shake Weight -lrb- not a heavy weight -rrb- be help I tone they . I love the fast 6 minute workout too . I keep the dvd inside my computer for a quick workout anytime . the Shake Weight workout have already increase my arm strength -lrb- something i want -rrb- . I do get sore muscle at first so take it easy .