Cool-down 1: Calf stretch. After running, it's important to walk or jog for 5 minutes to let your heart return to its resting rate and let your body begin to cool down. Then follow with gentle stretches. First, put your hands against a wall. Put weight on right foot, left foot behind. Bend right knee and keep left straight. Push palms against the wall. Hold for 20 seconds. Then reverse. Repeat 2-3 times on each side.