Dr. Liz Bottrell, PT, DPT, FAAOMPT, manual physical therapist and owner of Artisan Physical Therapy in downtown Portland explains what the basics of core stability and the "forever exercise" for your transverse abdominus and other abdominal muscles. This helps prevent and treat low back pain, back instability, sciatica, radiculopathy, herniated "bulging" discs. Doctor Liz Bottrell describes the essential components for proper positioning, control, and common errors. This exercise can be scaled up or down to be made easier or harder.