Dispelling the Ab Myths:The action of any muscle is simply to contract. And as you can’t contract half your bicep or quad, it makes sense that you cannot contract half your abs as well. Therefore the myths about “upper ab” and “lower ab” training are total nonsense. I’m not discounting those training methods but the simple fact is that if you can’t see your lower abs, it just means you’ve got fat covering them, not that you need to work them harder.Say goodbye to hanging knee-raises, straight-leg raises, and any other type of leg raises for building your abs. They simply don’t work. The primary role of your abs is to stabilize your body. When you raise your leg for example, your hip flexors pull on your spine and arch it forward/downward. Your abs stabilize this action by resisting and essentially keeping your back from breaking. Take note that this is the static action of the abs. It doesn’t build or strengthen. Leg raising exercises only feel like they are effectively working your abs because of the repeated strain and exhaustion of your muscle producing catabolic, lactic acid build up. Search for “lactic acid” at http://www.muscle-body.com for more information.