Achilles Tendonitis happens when you torque the Achilles tendon, which connect the two large muscles of the calf to the heel - usually by rotating the upper and lower leg in opposite directions. The tendon, which is the largest and strongest tendon in the body and can withstand a force of 1,000 pounds, is especially vulnerable when you increase your training dramatically (or fall in a hole). After a tear, you'll need surgery and/or immobilization. You can prevent tears with stretching and by warming up the area, along with good, stable shoes.
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