Want to work your legs and butt but don't have any weights? Find a step, box, bench, or sturdy chair and learn how to do a step-up. The step-up exercise combines the mechanics of a lunge with upward ...

If you've ever carried a suitcase or bags of groceries up a few flights of stairs, you know how intense it can be. Your heart is pumping, your legs and butt are burning, and your arms are toast by the ...