On a lower step, you don't have the full ROM that a higher step provides. If you go to a high step, you would have to drop your weight. Let's say you drop to 15 lb db's. That's 30 lbs total and with high step-ups, it's a one-legged move. So, that sounds about right to me.
However, for me, if I really concentrate on NOT letting my resting leg assist on a 20" step, 10 lb db's is about it for me. My squats are at about 75-85, depending on reps.
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Jane
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