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Over-training (usually in distance, occasionally in speed).
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Alignment problems : flat or high arched feet, overpronated feet, mal-aligned knees, leg discrepancies.
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Improper footwear: ill fitting, inadequate support, inadequate cushioning.
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Weakness in foot, leg, pelvic or trunk stabilizing and propulsive muscles.
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Lack of flexibility.
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Poor running form: overstriding, poor foot plant, inefficient arm carriage and trunk rotation.
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Slippery, uneven or rough running surfaces.
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Lack of rest.
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Poor nutrition and hydration.
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Previous unresolved injuries either from running or other activities.
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