Lumbar Spine Stretch 

• Lie flat on your back with your knees bent at 90 degrees and feet flat on the floor.  Place your arms out to the sides. 
• Keep as much of your back on the floor while gently rolling your knees to the ground on either side. 
• Hold the stretch for a count of 10-15 seconds.  Repeat on both sides 3-5 X's or until stretch is achieved.

As with any exercise, if you have any health concerns always consult your doctor first. Some exercises  may not be suitable for your condition and may cause more harm than good.