"Top Trainer Reveals 2 Moves for Killer Abs"

According to strength coach Jeff Cavaliere C.S.C.S., you only need two exercises to work both the upper and lower abs: the corkscrew for the lower abs and the upper circle crunch for the upper abs. For a more advanced fitness level, you can add weight or try a hanging version on a pullup bar. However, Cavaliere points out that neither of these exercises will lead to a visible six-pack unless you are first making sure that you're getting your nutrition right.