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The normal arch functions as a shock absorber for our entire body. Each time we step down we place up to 5 times our body weight on the foot,
 depending on whether we are walking, running, jumping, or carrying heavy loads. If the arch is either too low or high, it cannot function as efficiently as a shock absorber; thus, the pressure of each step is absorbed by the soft tissues and bones of the foot. These structures are not designed to absorb these forces, and after a few hours they become "tired or achy."
Biomechanical problems in the feet, such as pronation, may prevent the ligaments, tendons, and muscles from binding the joints together properly. This allows the joints to slip, the arch to collapse, and the bones to move into abnormal positions. When these actions occur, the foot can no longer act as an efficient support for the body. The results are feelings of fatigue and "achiness" which spreads to the legs and back.
Loss of the protective fatty pads in the heels or balls of the feet can also lead to tired and achy feet and legs. These fatty pads act as cushions which absorb the tremendous forces that are applied to our feet with each step that we take. If these pads become too thin, or disappear all together, the bones and joints in the feet absorb these stresses instead. When this occurs, our feet become tired, "achy," and eventually painful. This fatigue eventually travels to the leg muscles, causing them to ache.
Carrying heavy loads, whether they are heavy trays of dishes or heavy pieces of equipment, will also place increased and abnormal forces and weight on our legs and feet. These forces and weight will eventually cause the body's natural shock absorbers (the arches of the feet) to collapse, and our fatty cushions to be destroyed. As this occurs, our feet and legs become "tired," producing aches and pains in the feet and legs.
Similarly, when we gain extra weight, our feet and legs do not become larger and stronger. Carrying extra weight will tire the feet and legs out quickly, causing "achy" and tired feelings. This may eventually lead to pain.
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