Finding an hour to sweat it out at the gym can be tricky—which is why we're psyched about this new routine from Miami-based fitness expert Jessica Smith. The unique moves are designed to challenge multiple muscles at once. It may be quick, but it's tough!
You'll need: A pair of 5- to 15-pound dumbbells.
How it works: Do each exercise for 1 minute, completing as many reps as you can with proper form. Do the full circuit 2 times total.