Swim 3.8 kilometers (2.4 miles) , Bike 180 kilometers (112 miles) and Run 42 kilometers (26.2 miles). All under 17 hours.
It's the Ironman.
And if you can't join them... watch them in action this Saturday (December 18th)!
What these athletes will do to just get to the start line is monumental by any standards.
Swim 18 miles (29km) per week
Bike 350 miles (560km) per week
Run 60 miles (96km) per week
Calories burned weekly: 30 000
Extra meals per week an ironman eats: 42
Pounds an ironman would lose per month without these extra meals: 34