The expanders are quickly on the limit with little force, the accompanying exercises are a joke. Not hard to. If you want to, for example, stretch by standing with one foot on the handle and the other handle pulls up behind his head, one would mind. Be 50 cm larger in order to ever bring a strain state can (I'm about 176cm tall, so even not just the smallest). The material is to quite unpleasant, is quickly sticky and smells. A waste of money.