Keith O'Malley-Farrell HIP FLEXOR STRETCH 

Most important stretch for the vast majority of back back that just creeps on.
Increase the mobility of the hips, allow your pelvis realign, this Weill enable the lower back more freedom and movement and should reduce compression, pain and discomfort.
30 seconds each side x 3
TWICE A DAY EVERYDAY if you're suffering back pain (morning and evening)
Morning time everyday if you've got irregular back pain
Before EVERY EXERCISE if you've had back pain in the past
Before EVERY EXERCISE if you want to excel during that exercise session