What you must do: Sat on the edge of a flat bench, the hands in support behind, the thighs and the legs form a right angle from approximately 90%, them
feet are slightly separated of the ground.
Highest raise the knees possible in the direction of the chest, return slowly to the starting position without putting back the feet on the ground.
Breathing: by carrying out this exercise expire (to empty the lungs) while assembling the knees and inspire (to inflate the lungs) while going down again.
