May 19, 2014 12:00 AM

It’s the time of the tummy

“Seven Nation Army” by the White Stripes was pulsating through the dimly lit Ab Attack class at Crunch gym near Union Square in New York on a recent morning. Jewlie Williams, 25, a fashion stylist, was in front of the packed room, wearing a tank top and leggings and following the instructor in a 30-minute nonstop sequence of standing crunches with high knees, planks and toe touches with legs raised: all exercises focused on developing the muscles of the midsection.

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