I suppose as MCFC_Phil said, resistance is resistance so maybe the rubber bands will work and to be fair these are probably a lot heavier than the ones I've used for physio. Having said that, i don't believe that bloke in the ad got in that shape from using them. Probably years of training (weights), decent diet, good genetics, and maybe some pharmaceutical help along the way. Whatever you do is going to be better than just boozing and wanking of in front of the tv, so if they don't cost a fortune give them a go and you tell us if they are any good?