Last week I suffered a torn meniscus of the left knee. I can't do my regular step, hi/lo, kickboxing or dancing, and squats and lunges are out for at least another 3 weeks. The PA didn't restrict other movements and suggested I bicycle or swim for aerobic exercise, which I haven't done as yet. What effective leg and glute exercises could I do as a substitute for squats and lunges to keep up my muscle tone in the interim?