It might seem like race-car drivers are just sitting in cockpits, spinning in circles. But the strength it takes to maneuver a high-performance vehicle around curves and through traffic, often without power steering, at 200 mph as the G-forces take their toll is up there with just about any pro sport. That's why once outside the cars, so many drivers rarely slow down. "Each Sunday is like a bloody triathlon,” the 2014 IndyCar series champion Will Power says. "You'll just be better, you'll be faster, if you're fit. You just will be." As the summer racing season gets underway with the Monaco Grand Prix and the Indy 500 last weekend, and the 24 Hours at Le Mans in June, here’s a glimpse into what these top athletes, who can’t seem to sit still, are like when they leave the raceway.