honestly if you start to bulk mostlikly you are lifting too much. it's very hard for women to bulk without hormones or extra sups. stay with light weights, if you can afford it get a swiss ball..24 hour fitness sucks...but they have the best swiss balls i have found...if not nortitrac is good too...they usually run no more than $30. you can practically do a whole work out with it, and there are books that are great to give you ideas on what to do with the ball...then create your own stuff. to any extra carricular exploreres out there....