Yes, it depends on the workout. I have used up to 45# in PLB (actually a bit more, as I've done these with 15# on a weighted vest + 35# on a bar = 50#). In other workouts, it's anywhere from ä 10" medicine ball or weight to two, 15# dumbells. I even do some with NO added weights (in HSTA, where there are a GAZILLION leg presses, I like to vary them from set to set rather than do the exact same weight, height and range of motion: I do some on a lower step with more weight, some on a higher step with less weight, and some coming down to the side or back at a 45-degree angle to hit the inner thigh a bit more).