Fitballs. Swiss exercise balls. Stability balls. They are three different names for one very effective piece of exercise equipment. Originally used to assist physical therapists, this giant inflatable ball adds entertainment to your workout. You can sit on the Fitball, lie on it, roll on it, put your feet on it, and place your tummy on it. Imagine that! {relatedarticles} Incorporating a Fitball into your exercise routine increases the dimension of your workout. As you exercise on a Fitball, ...