Tom Perri is about to run his 600th marathon. He's run marathons in all 50 states - and he's done that 5 times in every state. He ran nearly 100 of his most recent races while battling cancer. We talk with Tom on where he gets his motivation, even on dark days, pacing marathons for other runners and what he most wants to be remembered for on today's 5 Things episode. Listen at our link in bio.