From a sitting position, unbend the knee and bring one foot up to the level of the knee. this is

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.