The longest, strongest tendon in the body, the achilles can withstand a force of almost half a tonne without tearing; yet is still susceptible to wear and tear from excessive training. The result is achilles tendonitis - a partial rupture or inflammation of the band of tissue that attaches the calf to the heel. Often players can return quickly after a course of anti-inflammatory drugs prescribed by a doctor, but it is crucial not to resume playing too soon.