Death of a labrat

Perhaps I shouldn't speak ill of the dead, and not refer to the recently deceased member of a Toronto lab as a "labrat".

I didn't know this person, have never met him. But Peter Watts' description of the event - blood clot mobilisation, probably resulting in stroke - mentions his age: 28. Apparently, he died at the gym.

I'm 28, I work in a lab, and I (rarely) visit the gym. Should I be worried?