The burpee and the kettlebell swing are known as two of the toughest, fast-paced, total-body exercises out there. So we thought, why not combine them into brutal fitness challenge?

(Think those two movements are bad? Here are 11 Brutal Exercises You Love to Hate. How many have you tried?)

Here’s how it works: Perform as many burpees as you can in 30 seconds. Rest for 30 seconds, and then perform as many kettlebell swings as possible in 30 seconds. Rest for 30 seconds. That's 1 round. Do 3 rounds total. Count your reps to keep score.

For another fast and furious burpee and swing drill, check out How to Lose Belly Fat with Just Two Exercises.

"To fly through this challenge, you have to be strong, explosive, and have some seriously high levels of aerobic conditioning," says Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan, who demolished this challenge with 77 reps. How many can you do? Try it and let us know in the comments below.

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