Several years ago, at age 60, Mona Weiger decided to give her son Kyle’s online fitness program a go. His video tutorials focused on mastering handstands—a move Mona “never dreamed I’d be able to do,” ...

Fitness pros share their favorite exercises to do in the swimming pool. (Getty Creative) Let’s be honest: The last thing you want to do on a hot summer day is go for a run. But just because the pool ...