Make Stretching After the Run Part of the Run

A workout isn't over until you stretch thoroughly (part of your cool down period) immediately following the run. Your legs will be most receptive to the benefits of stretching immediately after you run. Waiting 30 to 40 minutes later after your fatigued and tight muscles have cooled down (especially after long or fast-paced workouts) increases your chances of causing injury. In short, stretch gently and slowly while your muscles are still warm. Make the after running stretch part of the cool down process. from marathontraining.com