Walk into any gym, and you'll see men pulling, pushing, picking up, and putting down weights. But physical fitness isn't just about lifting iron. It's about how strong you are relative to your body weight. That's why Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan tests his athletes' upper-body endurance with this super-fast, muscle-blasting pushup challenge.

Ready to try it? Grab a stopwatch. Do 10 pushups in 10 seconds, and then rest 10 seconds. (If you perform 10 pushups in less than 10 seconds, add the remaining seconds to your rest time.) That's 1 round. Repeat for as many rounds as possible until you are no longer able to complete all 10 pushups in 10 seconds. Durkin completed 8 rounds. What was your score? Let us know in the comments below.

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Having trouble? Don’t fret! Here’s how to Perfect Your Pushup.

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