First of all, let me give you a little background. My father, who is in his mid-80s, was a member of my gym for about two years. At first, he agreed to hire a trainer to teach him about the weight machines as well as other exercises he could do. Despite those few sessions, he rarely approached the weight machines. He would go to the gym only if I went and would ride the stationary bicycle beside him. He never would go by himself to work out, even though there were other people around his age at...