The Achilles tendon is the largest tendon in the body. Stretching from the heel to the calf, it plays a crucial role in movement. It works when we walk, run, climb stairs, stand on tiptoes and jump. Whilst it can withstand great stress, injuries to the Achilles are common. They are normally the result of sudden sharp movements, such as in sport or when sprinting to catch a train where great force shocks through the tendon. The Achilles can also become inflamed from repetitive stress over a number of years as that causes tendon degeneration.