You can accomplish a lot in just 5 minutes: Shower, set your DVR, stalk your ex on Facebook. But can you crank out 300 reps of five tough lower-body moves in that same amount of time?

"This challenges hits your legs from every angle imaginable," says Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan. "It’s a beast--and you’ll need the legs of a beast to finish it in 5 minutes or less."

That’s because the rep scheme gets higher as you go along. "You never get a break," Durkin says. "It’s an all-out assault on your lower half. You’ll feel the burn from start to finish."

Here’s how it works: Grab two 12-kilogram kettlebells. Perform 10 kettlebell front squats, 20 body-weight squat jumps, 30 kettlebell walking lunges, 40 body-weight skater jumps, and 50 rope jumps, resting only when needed. Repeat one more time.

Build muscle and fry fat all over with this killer Total-Body Kettlebell Workout.

Watch the video above to see how to perform the challenge. Then give it a shot. Did you beat 5 minutes? Let us know in the comments.

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