Jena Olson walked into a CrossFit studio about four weeks after giving birth last year. She’s pretty sure Instagram made her do it.

“I was just scrolling through Instagram while breast-feeding my baby at 2 a.m., and someone posted an ad for a postpartum fitness class,” said the 31-year-old accountant. “I’d never done CrossFit in my life, but I figured, why not try it?”

The…

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