Fit mate

My mate was the fittest person I knew.
He went to the gym 7 days a week.
he entered Ironman contests, he even did back-to-back marathons once.
Then one day he went for a jog in the park and BANG!
He went to the gym 7 days a week.
he entered Ironman contests, he even did back-to-back marathons once.
Then one day he went for a jog in the park and BANG!
Spoiler: