There's no denying that the six-pack muscles are the most popular abs muscles. But your core houses of a bunch of abdominal muscles that help stabilize bend, and rotate your torso. This three-move challenge from Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan, hits all of them: the transverse abdominis, a deep abdominal muscle that's part of the musculature that maintains spine stability; the obliques, the muscles that run along the side of your core and help rotate and resist rotation; and the rectus abdominis, a.k.a. the six-pack muscles that pull your torso toward your hips. (Reveal the abs you never knew you had with the 6 Moves for a Six-Pack.)

Here's how the challenge works: Grab a stopwatch. Perform 16 tiger pushups, 16 single-arm thrusters, and 16 single-leg V-ups back-to-back. That's 1 round. Do 2 more. Complete the challenge as quickly as possible, but maintain good form the entire time to lower your risk of injury and to increase muscle recruitment. Your goal: 4 minutes and 10 seconds. What was your time? Let us know in the comments below.

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Add these 4 Post-Workout Moves That Burn Fat to your regimen, and that extra belly roll will be gone soon.

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