I have see the commercial one night on television and say `` huh , you have get to be kid I '' . I wait many month before I decide to purchase this . I have lift weight since I be a teenager and do all kind of workout with weight in a gym and at home . when I try it I be impress with the result and know it be well worth the price . I do notice on the dvd -lrb- unsure if anyone else notice this -rrb- , but you see he on one arm shake it , then you see he on another , -lrb- unsure why that be -rrb- . I do notice that when you do take one day off then try it again the day after you rest it become harder . so when he say see you tomorrow you bet you should do it daily . as far as do it more then once in a day I would highly not advise this , find another exercise to do , just add more rep the next day if you feel that day workout be not as good as you hope it to be . I have have a few people come over my home and try it out . Grant it they do not lift weight like I have for many year , but these people be struggle and not complete the rep properly . if you want tone and better vascular development , then this be ideal for you !!!