As you ramp up your training, eat more, and at the right times.
We like to assume that increased training translates to better health and, thus, more energy. However, when we increase training for a long race, we are sometimes left feeling lethargic, instead of more energized.
For many, proper nutrition throughout hard training is an afterthought. Eating well during your training cycle, not just on race day, is key to optimal performance.