An allergy to exercise might sound like a couch potato's dream, but for Kasia Beaver, a mom of four who lives in the UK, it's a nightmare.
Whenever her heart beats too fast and she sweats, it sparks a potentially fatal allergic reaction. Her eyes swell shut, she breaks out in hives and her throat closes up.
"It's terrifying, especially if I'm alone with the children," she said.
The 33-year-old is just one of a handful of people who suffer from a life-threatening allergic reaction to...Full Story