This is my favorite calf machine. Have seen alot of growth with this. I do not think this is the type of exercise machine you are supposed to get a max on. I have tiny calves but am always surprised how much weight I can use on it. I always put it around 210 and do 4 sets of 10 reps with varying foot positions. Keep your legs slightly bent and really stretch that calve out when pushing against the foot pad and control the weight when its coming back down.