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…