Jim Dreeben, 83, took up CrossFit in his 80s and got hooked. He does 100 push-ups and also planks six days a week, and his doctor told him to keep going. Dreeben's active lifestyle includes kayaking, ...

I'm not the biggest fan of upper-body workouts, i.e. push-ups, but I do know that that I've got to do them if I want to have a strong upper body. I don't have the desire to do 50 push-ups first thing ...

Push-ups are one of the most effective bodyweight exercises around. They recruit every major muscle group, challenging your upper body, core, glutes, and legs. Plus, you can do push-ups anywhere—so ...

Jim Dreeben has always been active, but it wasn't until he was in his 80s that he took up CrossFit. Dreeben, a retiree in Riverhead, New York, now does weekly CrossFit sessions and 100 push-ups six ...