Roughly 75-80% of all LOW BACK PAIN is actually just a symptom of the problem elsewhere (most likely from your hips). This exercise is an active stretch for your hip flexors and helping to improve your hip mobility. Using a 12″ box/step (and something to hold onto at first) you go into a deep lunge position to improve hip flexor elasticity (knee that is down) and open up the posterior capsule of the front hip. NOTE: START WITH SMALL STEP FIRST and MAKE SURE YOU SQUEEZE YOUR BUTT MUSCLES & MAINTAIN A TALL POSTURE THE ENTIRE TIME