“Abs are made in the kitchen, not in the gym!
No amount of weird exercises or machines will magically reveal your abs. The ONLY way to reveal your abs is to lose that layer of fat covering them. Now, the only way to lose the abdominal fat is by consistent dieting and cardiovascular exercise. Period. All those odd hanging, leg twisting, body contorting exercises are no better than simple crunches.
The big problem is that intellectually, many people totally agree. However, emotionally it does not click. I know this because day after day I see people doing marathon abdominal work. They do four or five different exercises. They think the more they do, the more defined their abs will become. They try to target the upper, lower, inner and outer, left, right, etc. Give me a break. They do tons of weighted side bends trying to get rid of the love handles.
