(Image credit: Shutterstock) As a marathon runner who has a day job that requires me to spend a lot of time sitting behind a desk, it would be a miracle if I didn’t have tight hips. In an attempt to release them in the run-up to my sixth marathon, I added the lizard lunge to my stretching routine for a week. This yoga posture is one of the best ways to undo the effects of prolonged sitting . As well as stretching your deep hip flexors, you’ll also be working into your glutes, quads and hamstrings. Read on to find out more. As a reminder, what works for me might not be right for you and your body. If you’re a complete beginner, you’re pregnant or postpartum, or you’re recovering from a specific injury, it’s always worth checking in with a qualified professional before trying anything new. Article continues below How to do the lizard lunge (Image credit: Future) All you’ll need for this exercise is your bodyweight, but using one of the best yoga mats can help keep things more comfortable.…