Kettlebells have become the workout du jour for a good reason: The swings amp up your heart rate while the power moves engage every muscle in your body, resulting in a workout that's as effective as it is fast.
Choose a kettlebell you are comfortable swinging and try this circuit, created by Jenn Nims of Girl-Heroes. 2-3 times. Do each move for 40 seconds, resting for 20 seconds between moves. Complete the entire circuit 2-3 times. (You can see a video demonstration of the moves here.)
Kettlebell swings
Hot potatoes
Kettlebell swings
Kettlebell toss
Kettlebell swings