It's a split. I alternate between upper and lower body.
This week it's Upper, lower, upper. Then next week it will be lower, upper, lower.
I read, I think in a Men's Fitness magazine, that leg extensions are, for lack of a better word, lame. They said to do some other exercise to substitute for it; I think it was the squat, but I'm already doing that.
Today is leg day and I'm going to workout in about 10 minutes, so I'll probably just do squat and dumbbell lunges.
Thanks for your input. But if you, or anyone else, could elaborate on the leg extension/leg curl opinion, that would be nice.