The most effective way to prepare for a major endurance
event is to be sure that your training consists of blank percent carbohydrates

40-50 percent

Explanation:

To prepare for the major endurance, one must ensure to put 40-50 percent of carbohydrates in their diet because carbohydrates are the major source of energy. Our body first uses the energy from carbohydrate metabolism. If there is not enough carbohydrate in the body then fats are used as an energy source and then the proteins.

If there is enough carbohydrate in the body then one can perform enough functions and physical activities but the lack of it can make people lethargic and inactive and also affect mental health.

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theres nothing above