What muscle fiber type use in triathlon?

Triathletes primarily rely on slow-twitch muscle fibers, also known as Type I fibers, due to their endurance capabilities. These fibers are efficient at using oxygen to generate energy over extended periods, making them ideal for the prolonged aerobic activities of swimming, cycling, and running. While fast-twitch fibers (Type II) are also engaged during sprinting or high-intensity segments, the emphasis in triathlon training is on building stamina and aerobic capacity with slow-twitch fibers.