Your core is made up of more than just your abs. The many muscles between your hips and shoulders stabilize your spine and allow your torso to rotate and bend. "If you want to be stronger in everything you do, you need to work all of those muscles," says Todd Durkin, C.S.C.S., author of The IMPACT! Body Plan. This fitness test does just that with three moves -- the leg raise, the bicycle crunch, and the Russian twist. It'll measure your total core strength, stability and muscular endurance. It won't take long to find out if your midsection is up for the challenge or not.

Here's how it works: Grab a stop watch and perform 10 leg raises, 20 bicycle crunches, and 30 Russian twists, back-to-back without rest. That's 1 round. Do 2 more. Finish as fast as possible while maintaining proper form. (Try these 5 Secrets to a Perfect Workout and you'll never be held back in the gym again!)

Your goal: 1 minute and 48 seconds. Let us know your time in the comments below.

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