This abs workout is simple and it is one ow the easiest one there. There is no need of assistance and no need of a specicfic workout machine, no slying on the foor either.
Stand up streight with legs in shoulder width position; keep a streight back with chest forward. No move only the upper body sids to side without bending the knees. The lower body must be static at all times.
To make sure you maintain the body in the right position, stand in front of a mirror a. If you want to challenge the side abs muscles grab a set of dumbbells and make the side bends with them; it will definitely stretch and crunch them.