I am wondering to those of you who know this stuff so well (and there do seem to be quite of few of you, thank goodness). I am curious about changing the amount of weight that one uses for their workouts. For example, today I did GS Legs and I didn't feel as stong today as I did last time I did the workout so I used lighter weights. Is this okay or am I doing something that may be possibly backpedaling to a less strong me? I would appreciate any input. Thank you.