by Jen Ator, Women's Health Magazine

Four moves that guarantee a show-off stomach by Memorial Day.

Relying on crunches alone to trim your waistline is about as useful as wishing for a flatter stomach. To get results, you need to train your core to stabilize your whole body, explains Mike Robertson, co-owner of Indianapolis Fitness and Sports Training.

This workout engages your entire core and strengthens your back and butt muscles (slouchy shoulders and weak glutes contribute to an unflattering pooch). Do two sets of each move (eight to 10 reps per side) three days a week to streamline your silhouette fast.

*Mouse over the image for caption.

Athleta bolero, American Apparel bandeau, Body Up pants

There are 29 muscles in your "core." Crunches just work a few.

Check out more workouts from Women's Health:

- Get Lean Legs
- Get a Tight Butt and Legs
- Yoga on the Beach
- Transform Your Tummy
- Yoga for Athletes
- Yoga Poses That Burn Fat
- Get Tone with Yoga
- Stress-Busting Workout
- Look Hot in Jeans
- Fry Fat on the Mat
- Blast Your Body
- Total Body Tightening
- Flatten Your Belly
- No Gear Here
- The Best Exercises
- Ultimate Do-it-at-Home Workout
- Glute Camp
- Lean and Fit in 7 Minutes

More from Women's Health:

- Transform Your Tummy
- Ultimate Workouts To Get Lean, Firm, and Sexy!
- Reshape Your Body And Lose Weight In Just 6 Weeks!

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