Things that increase your risk for Achilles tendinopathy or rupture include:
Sports and physical activity. Overuse and repeated movements can cause injury and weaken the Achilles tendon. Playing sports increases the risk of an injury. Activities at work (such as in construction) and at home (such as gardening) may also increase your risk.
Sports training errors. Not warming up before running or other activities or suddenly changing your training program can increase your risk for injury. Increasing your distance, running uphill more often, or changing your ground surfaces too quickly can increase your risk. Decreased flexibility may also increase the risk of tendon problems.
Age. As you age, the blood supply to the Achilles tendon area decreases. Most cases of Achilles tendinopathy or rupture occur in people older than 30.
Weight. If you are very heavy, you have a greater risk.