What you must do: hung with the horizontal bar, the isolated hands of the width of the shoulders, the thighs are slightly folded and the knees are folded.
By contracting your abdominal muscles, raise slowly and gradually your basin by bringing the knees in the direction of the chest, then return to the starting position while going down again the knees.
So that this exercise effective is made long series (until feeling a burn on the level of your abdominal muscles).
Breathing: by carrying out this exercise expire (to empty the lungs) when you raise the basin and inspire (to inflate the lungs) when E you descend the knees.
