The foot and ankle region is a common site for running pain–after all, it’s the first point of impact. Elastic, flexible calf muscles can soften the shock down below, helping prevent injuries such as plantar fasciitis and Achilles tendinitis. These stretches are part of the Wharton’s Performance Model, a strength and flexibility foundation-building method for runners. Stretch after every run: hold two seconds; repeat 10 times on each leg.
Source: How To Stretch Your Calf Muscles | Runner’s World