This stretch will help loosen your upper hamstrings, along with your gluteal muscles (buttocks).

• Lie on your back. Bend your right knee towards your chest.
• Once your right knee is at your chest, put your arms around your right shin and bring it as close to your body as you are able to.
• Hold for 10-15 seconds, and let go and bring your right leg back to the starting position.
• Repeat for the other leg.
• Continue for 1-3 reps on each leg.

Tight hamstrings can affect your pelvis, which in turn can cause poor running posture. Stretch your hamstrings and glutes for better running form!