According to Robert Piparo, Lieutenant of the New Brunswick Fire Department, 40-50% of firefighter deaths in the line of duty are from heart attacks. He's on a mission to reduce that number, by helping his fellow firefighters stay fit. (And let's be clear—all the firefighters I see in this video already look like they're in great shape.)

Have you ever wondered what firefighters do to work out? Well, here's how they do it in New Jersey:

I feel sweaty and weak now.