A gym fanatic has hit back at his degenerative lung condition and defied doctors expectations by transforming himself into a real-life THOR.

Personal trainer Ben Mudge, 27, was born with cystic fibrosis and was spurred into getting fit when his lung function plummeted as a teenager.

Doctors told him he'd never fully recover - so he hit the weights to prove them wrong, honed a super-buff physique and improved his health dramatically.