Eccentric Achilles Tendon Strengthening

Young woman stretching calf muscle on beach, side view
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The most common injuries related to the Achilles tendon are Achilles tendonitis (microtears in and around the tendon) and Achilles tendon rupture (a partial or full tear that results in instant pain and loss of movement).

If you participate in sports that require strong forefoot push-offs—think tennis or basketball—it's important to protect your Achilles tendon from injuries. Recommendations for Achilles injury prevention include:

Some experts believe that eccentric strengthening of the Achilles, gastrocnemius, and soleus muscles may reduce the risk of Achilles tendonitis and calf strain. Because the eccentric muscle contractions cause the muscle fiber to generate more tension than either concentric or isometric contractions, eccentric muscle contractions appear to be associated with greater muscle strengthening, which may protect the Achilles tendon. Some argue that the benefit may be due to the stretching of the muscle during eccentric exercise and a corresponding lengthening of the muscle-tendon unit that results in less strain during ankle joint motion and fewer injuries.

While we may not know with certainty if the benefit of this eccentric exercise is due to the strengthening or the stretching component, it does seem clear that if this simple exercise can help reduce an Achilles or calf injury, it's worth giving it a go.

Eccentric Strengthening Exercise

This exercise is based on performing three sets of 15 repetitions on each leg twice per day, seven days per week, for 12 weeks.

  • Warm up with gentle stationary cycling, walking, or marching in place for several minutes.
  • Stretch your calf muscles.
  • Stretch your Achilles tendon.
  • Stand on the balls of your feet on the edge of a sturdy box or step, keeping your heels free.
  • Maintain control at all times and slowly lift up as high as you can on both toes (see first photo above).
  • Move your weight to one foot and slowly begin to lower yourself (this is the eccentric contraction phase) until your heels are just below the step (see the second photo above).
  • Shift your weight back to both feet and return to the start (top) position and repeat 10–15 times per leg.
  • Add this to your general strengthening routine 2–3 times per week.
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  1. University of Wisconsin-Madison School of Medicine and Public Health. Achilles tendon problems. Updated June 26, 2019.

  2. Hody S, Croisier JL, Bury T, Rogister B, Leprince P. Eccentric muscle contractions: risks and benefits. Front Physiol. 2019;10:536. doi:10.3389/fphys.2019.00536