calories required during marathon
When discussing race day nutrition it is important to understand the energy requirements. The average athlete expends approximately 100 calories per mile during a marathon. During a triathlon, the athlete expends approximately 500 to 1000 calories on the swim, 3,000 to 4,000 calories on the bike, and 2,500 to 3,000 calories on the run. Wow! That is some serious energy expenditure.