Push-ups always came easy to me. In my 20s and 30s, I could crank out more than 30 a day if I wanted to, and I loved how strong they made me feel. But the other day, when I went to do a set of 10 push ...

Sure, the push-up is a bodyweight exercise, but that doesn’t mean it’s easy—in fact, it can be really challenging to master. That’s why push-up modifications (basically, less intense versions of the ...