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Allison Williams Barre Ab Workout

Celeb Move to Steal: Allison Williams's Go-To Tummy Toner

We are pumped to share one of our favorite stories from Self here on FitSugar!

Allison Williams shows plenty of skin on the HBO hit Girls (not to mention the red carpet), which returns for its second season on Sunday, January 13, so it should come as no surprise that she works hard to keep her svelte figure in shape. When she's not playing beautiful and bossy Marnie Michaels, the actress can usually be found blowing off steam at Exhale in New York City, where she takes Core Fusion Barre classes.

The secret to her camera-ready curves? According to Core Fusion co-founder Elisabeth Halfpapp, Williams swears by a move called Round Back. "It's a very effective move as it strengthens and stablizes the whole abdominal wall," says Halfpapp. "It's perfect for creating long, lean muscles that keep Allison strong whether she's filming or on the red carpet."

Keep reading to learn how to do the move.

The Move: Round Back

Round Back Move from Exhale Core Fusion

Sit on the floor on top of a folded towel, shoulder blades against a wall and your knees bent. Keep feet flat, and make sure your back is rounded. Place your hands on the floor, near your hips, pressing your fingertips into the floor. (Or, press up onto a supported ballet barre if you happen to have one or are using furniture instead.) Squeeze abs and lift your feet off the floor. Bring knees towards your chest, then straighten legs so your toes are pointed towards the ceiling. Do 10 pulses.

Bring legs an inch closer to the wall then back an inch in a pulsing motion. If this is too challenging, make it easier by keeping left foot on the floor and bringing extended right leg towards you by grasping right calf with your hands. Hold for 30 seconds. Switch legs and repeat. Do three sets.

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Sources: Getty and Self
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