There are those who have characterized posture as "the constant struggle to remain erect against the force of gravity." Aristotle saw Homo Sapiens as a "mass of matter." Ida Rolf saw us as an "energy field." In both viewpoints, the greater, and more overpowering force is that of gravity. It is our constant goal, however momentary, to push away from this incessant force and fly, unencumbered from the earth's force field. To run. To glide. To fly.

Your posture has a lot to do with how easily you move. There are three factors for maintaining balanced posture which you should be aware of:

1. skeletal structure
2. soft tissue integrity
3. neurological control

Studies show that when these three factors are in harmony with each other, there occurs what is known as "intrinsic equilibrium" or "tensional integrity". Your skeletal system contributes to your size and shape. Problems can develop when there is asymmetry of shape or changes in joint function, reducing mobility and creating motion fixations (stiffness and decreased range of motion).

Soft tissue integrity is what holds you together and allows you to move. If there is a shortening or weakening of the connective tissues (muscles, fascia, tendons and ligaments), then your posture is altered and function is impaired. With neurological control, you have a complex alliance of several neurological factors, including reflexes, pain, learned behaviors and acquired habits. Add to this a history of injuries, occupational stresses and psychological makeup.

Another postural factor you must be aware of is the influence of your spinal curves. The four normal curves of your spine create a biomechanical advantage for shock absorption. Studies have shown that "optimal balance of these physiologic curves creates effortless, nonfatiguing posture that is painless to the individual." Running, walking, standing, jumping, anything we do in an upright position will be more efficient and allow for greater endurance in all endeavors.

Finally, as a runner, you must consider that the forces you create with each stride have been estimated to be up to 200% of your body weight. The wear and tear on your joints will only be magnified when there is imbalance or restriction. Strategies abound on how to prevent injuries and improve performance, but certain principles remain constant: maintain a properly aligned spine, stay flexible with daily stretching of all muscle groups, make sure you are adequately hydrated and eat appropriately. Watch your posture, particularly during the mundane actions like sitting, lifting, and bending. Your training doesn't end when you stop running, but your performance can benefit if you consider your posture as an integral part of your training program.