Gym Goer’s Arms ‘Exploded’ After CrossFit Workout Challenge [Video]

A South Carolina gym enthusiast says her arms “exploded” after she attempted to do a vigorous fitness challenge — which she says caused a life-threatening condition.

Jessica Johnson, 25, had been doing the “Murph Challenge” — a fundraising challenge consisting of running a mile, then doing 300 squats, 200 push-ups and100 pull-ups, before finishing with another one-mile run. 

“I was doing 10 sets of five pull-ups,” the Charleston-based healthcare worker said, and was “pretty tired” after her workout, as she told Kennedy News Agency, via the New York Post.

The next day, her arms were swollen and sore, but, “I thought ‘I haven’t done pull-ups in forever, it was a hard workout, they’ll go down, it’s fine,’ ” she said.

But instead of her recovering, her arms continued to swell.

“Everyone said, ‘We just thought you were super jacked or something,’ ” Johnson told the outlet.  

But then, she developed …