ⓘⓂⒶⓃ » Erectile Dysfunction Protocol PDF/Book, Jason Long - Page 76

Even worse is that the destabilizing effect is cumulative. ...so the spine gets more and more destabilized over time. Many people with amazing abs have put their lower backs in major jeopardy without even knowing it. This is exactly what happened to me! So because of this, in the past I recommended avoiding any ab exercise that flexed the spine forward. This included crunches, situps, hanging leg raises, every Nautilus ab machine, etc. I have changed my outlook on this...BUT only if you add in bridging. The hip bridge is the main exercise I prefer. Some people who are more flexible and who have a less “dodgy” lower back can do well with the full back bridge... By doing a bridge you are reinforcing the natural curve in your spine. This counteracts any negative destabilizing effect of ab exercises that “flex the spine forward”. 25