The majority of the hip flexor group of muscles come from the lower back, cross the hip and attach to the top of the leg.  When these muscles are tight from prolonged sitting they can cause the lower back to be pulled forward toward the top of leg and compress the structures of the spine.  This can disrupt correct functioning of the hips, pelvis and back and lead to pain in all of these areas.  This exercise will help stretch the hip flexor muscles so that the spine, hips, and pelvis can move back into better alignment and experience less pain and discomfort.