yes. a couple of reasons come to my mind - others may have even more.
Step ups there is a lot of work for balance and stabilizing muscles. Plus - you have one leg already doing twice the weight that it does in a body weight squat just because the other leg is out of the picture.
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"Have fun and be determined to finish"-- Jack "UpNorth", 9.
"You see yourself every day. Nothing changes. Change comes in an explosion of awareness. You wake up one day and it dawns on you that it's not a sleep line but a wrinkle." - Deserve (aka Gabe)
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