Structure

This side of the triangle represents all the physical, structural, and mechanical aspects of endurance. The most obvious ones are the muscles, which promote body movement for long periods without fatigue, and support the activities of ligaments, tendons, joints, and bones throughout the body, helping to prevent them from damaging wear and tear. All the muscles are part of a body-wide kinematic chain, with virtually all these structural parts very much dependent upon one another. And, these muscles rely on the bones—in fact, our entire skeleton—for their attachment and to help leverage movement; at the same time, the muscles hold up our skeleton. The bony arches in the foot enable us to run because of the muscles that support these arches. And the physical equilibrium of the bony pelvis, itself dependent upon good muscle balance, has an indirect but significant impact on neck and shoulder movements.

The structure of the brain and all the interconnecting cells (such as neurons) that ultimately tell each muscle fiber when to contract and relax are vital to endurance. Without body chemistry, however, providing fats for use as energy, optimal endurance won’t develop. Moreover, if we try to develop endurance only through training our body structure—working the muscles during training—without considering the importance of body chemistry, we won’t reach our athletic potential.

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