A clean 90° push-up demonstration focusing on form, shoulder stability, and core strength. See how proper technique improves ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty images/ Unknown The beauty of push-ups? There are endless ways to scale them.

Push-ups are one of those classic exercises you see everywhere, from bootcamps to yoga flows to strength workouts—and probably even in your gym class flashbacks. But if you find yourself grimacing ...