The “Achilles heel” is a common term for a weakness, and it’s no wonder since the Achilles tendon itself can be so easily damaged. This tendon – one of the largest ones in the body – stretches from your calf muscles to your heel. Achilles tendinopathy, formerly called Achilles tendinitis, occurs when over time repeated damage to the Achilles’ tendon builds up. Achilles tendinopathy causes...