Think of the most difficult body-weight moves in your exercise arsenal. Okay, what did you come up with? Most likely, the burpee and the pullup made the list.

These two moves are brutal. The burpee is an explosive, power exercise that works every last muscle in your body at a blistering pace, while the classic pullup tests your upper-body strength from a dead hang. Men have been known to quiver in fear at the thought of doing multiple reps of them.

Now, Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan, is pairing the moves into one lethal total-body challenge. You'll perform the two moves 20 times--yes, 20!--to test your endurance and willpower.

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Can you beat Durkin's lightning-fast time of 2 minutes and 10 seconds? Try it, and then let us know in the comments below. (Build a better performing body and a sculpted core with The Toughest Exercise You Aren't Doing (but Should).)

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