Tight hamstrings are common in runners. The faster we run, the more stress we place on our hamstrings, which can result in fatigued and tight hamstrings. Weak hamstrings will also fatigue quicker so it is important you include hamstring strengthening in your strength routine. Stretching your hamstrings will help relieve any tightness and improve your flexibility.
A Standing Hamstring Stretch is a simple static exercise. Place one leg on to a chair, wall, bench or step and straighten it out in front of you. Bending from the hips, lean forward until you feel a stretch in your hamstrings. Keep a slight bend in the knee so your knee joint isn't locked. It is ok if you need to bend your knee further to feel the stretch too. Don't worry if you can't reach your toes, most runners won't be able to! Hold for 5-8 breaths and repeat on the other side.