Bodybuilding: abdominal - Extension of the legs on bent bust

What you must do: Sat on the glutei and the bottom of the back, the folded legs, the separated feet of the ground, your front armlevers are also in support on the ground. While contracting your abdominal muscles and while keeping the bust in the same position, bring back your knees in the direction of the chest, then return to the starting position without putting back the feet on the ground.

Breathing: by carrying out this exercise expire (to empty the lungs) when you bring back your knees in the direction of the chest and inspire (to inflate the lungs) when evenez with the starting position.