Active Isolated Stretching (AIS) is a technique that lengthens and strengthens muscle tissue. Our muscles have two major functions: to contract or relax. The idea of AIS is to hold a stretch for one to two seconds, relax, and then repeat the movement for 10 to 15 times for one to two sets. When the stretch is done right, you should be able to increase your range of motion with each additional set.
The benefits of incorporating AIS into your routine are numerous: increased isolated flexibility, realignment of the body, reduced chance of injury and better awareness of your body. Try the following routine four to five times a week after your runs.
Original article and pictures take www.active.com site