The attached pdf demonstrates three simple poses for the runners. If your hips are really tight, bend the back knee in Crescent Lunge and definitely use a block, step or still under your lower hand(s) in the Pyramid and Revolving Triangle poses.
Crescent Lunge works the front glute and hamstring and stretches the back quad and psoas. Pyramid is a great one for getting deep into the hamstrings and glute muscles. Revolving Triangle is one of my favorites for getting high into the hips and lateral gluteal muscles. This last one is probably one of the most difficult poses I do, so don’t be intimidated if you feel clumsy at first.
Be persistent (3-5 times/week) and patient with your yoga and you will soon see many of the benefits.