This exercise works all the abs but targets the lower abs and the deepest ab muscle, the transverse abs. The abdominal muscles are working more as stabilizers against your powerful hip flexors in this move.
- Using a pull-up bar, get a good grip with your palms facing out or toward each other.
- Start with your legs hanging straight down, and on an exhale pull your abs toward your spine and bend your knees, lifting them toward your chest.
- Without swinging, slowly lower your knees, returning to a straight-leg position.
- Repeat for a total of 10 to 12 reps.