You'll also enjoy the side - benefits of rock hard abs, thick arms, a wide back, and big strong legs. (chestsculpting.com)
The hanging knee raise is a classic ab exercise that will build rock hard abs when performed correctly. (fitnessandpower.com)
While rock hard abs and low body fat percentage can be signs of optimal health in men (as it reflects healthy testosterone levels), this is not the case for women! (wellnessmama.com)