Most men's workouts usually target the mirror muscles -- biceps, chest, and abs. But when it comes to building your best body, you can't ignore your lower half. Working your glutes, quads, and hamstrings can boost your metabolism and increase your testosterone levels, helping you crush more calories and build more muscle from head to toe, says Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan. Hammer your lower-body muscles and get your heart pumping with this fitness test that involves body-weight squats, burpees, and sprints. Fair warning: Your legs will feel like jelly when you're finished.

Ready to try it? Watch the video to learn how to perform the challenge. Durkin completed the circuit in 1 minute and 47 seconds. What was your best time? Let us know in the comments below.

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