Ok , this product will not turn you into a rip muscle god but it really do work . my chest , back and arm be defiantly tone up since I have be use this . I use it once or twice a a day . the only other thing I do other then use the shake weight be sit up 's ! it really do work but you must use it daily to see result . also , it take about a month to start see result . I look forward to use the shake weight everyday !