A woman in England is allergic to exercise.
The 33-year-old mother of four can't work up a sweat as an increased heart rate causes her to swell up and could spark a potentially fatal reaction.
She first suffered the problem in her 20s. Doctors found she suffers from the condition known as Exercise-Induced Angioedema.
Now, thanks to a new type of antihistamine, she can walk to the park for the first time in 10 years without having an attack.