If you only have 15 minutes to sweat, it's easy to skip out on a workout. I mean, how much can you really accomplish in 15 minutes, right? Umm, a lot, actually—if you spend them wisely. That's the ...

Calling all F45 lovers and gym class lovers – if you can't afford to keep forking out for sessions, circuit training can be done from home, too. With the help of the best circuit training instructors ...