(Hyperextension is typically achieved by balancing the forefoot on the edge of a step, a thick book, or a barbell weight so that the point of the heel is a couple of inches above the forefoot.) Treatment
Treatment typically involves rest, ice, non-steroidal antiinflammatory agents (NSAIDs), and physical therapy. A heel lift or orthotics may also be helpful, but evidence on both heel lifts and orthotics is limited. Foam rolling may increase range of motion, but there is only weak evidence for the direct treatment of stiffness. Other treatments include:

An eccentric exercise routine designed to strengthen the tendon. Application of a boot or cast. Injections
The evidence to support injection therapies is poor. This includes corticosteroid injections. These can also increase the risk of tendon rupture. Autologous blood injections - results have not been highly encouraging and there is little evidence for their use. Procedures
Tentative evidence supports the use of extracorporeal shockwave therapy. Epidemiology
The prevalence of Achilles tendinitis varies among different ages and groups of people. Achilles tendinitis is most commonly found in individuals aged 30–40 Runners are susceptible, as well as anyone participating in sports,
and men aged 30–39.Risk factors include participating in a sport or activity that involves running, jumping, bounding, and change of speed. Although Achilles tendinitis is mostly likely to occur in runners, it also is more likely in participants in basketball, volleyball, dancing, gymnastics and other athletic activities. Other risk factors include gender, age, improper stretching, and overuse.
Another risk factor is any congenital condition in which an individuals legs rotate abnormally, which in turn causes the lower extremities to overstretch and contract; this puts stress on the Achilles tendon and will eventually cause Achilles tendinitis. References


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