Discover why one high-impact exercise can worsen knee pain for retirees and explore joint-friendly alternatives that keep you ...

Clasp your hands in front of you and push your glutes back as you bend your knees to lower into a squat. When your knees get to 90°, pause for a second then start to push up to standing.

It is a cardio machine that for the first time gained ... especially for those with weak knees. Before we delve into how it affects weak knees, let's first figure out how a cross trainer works?