Cathe or someone who knows, please resolve the walking lunges question about how to count them. Does 1 lunge consist of a step forward on one leg only or is it one leg AND the other? I've been watching the previous thread, but noone that has answered seems to know for sure. I want to start doing them, and want to know just how much torture 400 would be. Also, what about doing them with weights. What would be the pros and cons? Thanks so much!