For the past 2-3 months I've been doing either BodyPump (at home with a video) MIS, Powerhour, or the PS Series. I have the bodypump weight bar and weights and dumbbells up to 10 lbs. The problem is that for the leg portions I've been using the max on the barbell (45 lbs). I'm concerned that I have no where to improve now without more weight. I've tossed the idea of going back to the gym to lift weights (since they have much more wieghts) but I really enjoy working out at home. Can I buy more weights for my barbell or is sticking with the 45 lbs enough? I don't want to get into a plateau. I could use 12-15 lbs for the upper body but the barbell still has plenty of weight on it. Any suggestions?