Personal trainer Ben Carpenter has a rippling six-pack but can't do a sit-up, he told Insider. Carpenter's ab definition comes down to his low body fat levels which are a result of chronic illness.

First: “The six-pack abs so many people chase are actually just one muscle, not six,” explains Melody Dickerson, a certified personal trainer and instructor at Fhitting Room, a high-intensity ...

Everywhere you turn, it seems there's some new get-abs-quick device that promises to help you sculpt the waistline (read: six-pack) you want. And fast. One of the newest: the Simply Fit Board .

To carve out six pack abs you need exercises that grow the muscles, and these two moves recommended by a personal trainer are ...