The ultimate in endurance sport is an Ironman triathlon. These athletes swim 2.4 miles, bicycle for 112 miles and then run a marathon of 26.2 miles (140.6 miles total) in one day, so they really need to be prepared. The best do it in about nine hours. We wondered: What do triathletes eat and drink before a race?
It turns out a lot. The typical Ironman athlete burns 7,000 to 10,000 calories on a race day, so they need to really consume a lot of food. They also metabolize a lot of water, so they need to take in copious amounts of fluids on race day.