What is the Achilles tendon ?

The Achilles tendon, or calcaneal tendon, is the strongest tendon in the human body ! 

It protrudes, is on average 15 cm long, and consists of collagen fibres that are wound into firm spirals. Its structure is comparable to that of a very strong rope. The tendon is formed from gastrocnemius and soleus muscles and is inserted into the heel to the calcaneus bone. When the aforementioned muscles (calf muscles) contract, they lift the heel bone by pulling on this rope (the tendon). It is therefore very useful for correct walking, running and climbing stairs.