I had always been doing my leg curls, extintions, and presses with both legs. I decided to switch it up a little bit and do them with single legs. What I found out is that I must have been working my right leg alot harder than my left. 20 reps was no prob with my right leg, but getting 15 was too hard with my left leg. Should I continue to work my legs separately to try to even them out, or should I focus on them together? What do you guys do?