Isthmic spondylolisthesis can cause nerve root irritation or impingement.
The goal of this method is to teach the lumbar spine to remain stable in a flexed position. Therefore, the exercises are a combination of both programs. Lay on the back with knees bent and flatten the back by tightening the lower stomach muscles. Lay on the back with knees bent, fold arms across the chest, tilt the pelvis to flatten the back, and curl-up lifting the head and shoulders from the floor. Do not attempt to lift too high, and bring the head and chest towards the ceiling.