While you could always swim laps if you want to work out in a pool, there are plenty of other exercises to do in the water that are just as beneficial. Think squats in the shallow end, push-ups ...

Out of all the popular push-up modifications, experts agree that this version is the easiest starting point that still targets the same muscles.

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 ...