Hi Pauline - I'm 5'2" and use a weight-bench for step-ups. I haven't measured the height of my knee, but when I look in the mirror, on the bench I use for step-ups I have pretty close to right angles at my hip and knee when I put one foot on the bench... At my gym, there is one bench that's about 2" shorter that works best for me - the other ones put me slightly above right-angle-height, but I make do if I must...
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