There are seven muscles that generate up to 80% of the propulsive force necessary to maintain forward velocity when you run. Two of these muscles are your gastrocnemius and soleus muscles that form your Achilles tendon. The other 5 muscles are located on either side of your ankle joint and help maintain your balance and to control foot pronation. Make sure that these muscles are good and strong in order to prevent injuries and optimize your running mechanics. This 6-week program involves 1 simple exercise per week to strengthen these important muscles.