Toward the end of prolonged exercise for more than 2 hours, circulating __________ supply (supplies) nearly 80% of the total energy contribution.

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During prolonged exercise extending beyond 2 hours, the body increasingly relies on free fatty acids as the primary source of energy. This shift occurs as glycogen stores are depleted, and the body turns to fat stores to fuel ongoing physical activity, with free fatty acids supplying nearly 80% of the energy needed.

Toward the End of Prolonged Exercise for More Than 2