You can smile but I am not forcing anyone 🙂
Take a very deep inhale starting with the diaphragm adding the inter-coastal muscles (your ribs) and ending with your shoulders. Feel and sense how your body shape and tension is affected through this and slowly exhale in the reverse fashion. Repeat the drill with a fist or the end of a stick pressed into you and feel how your body moves to allow itself to breathe fully and move away from harm. Repeat this in different positions and directions and after you switch with your partner a few times continue to pushing into your partner during any part of the breath and after this is done simply breath without stopping and have your partner hit you using a fist or a stick all over your body (the head and neck and legs as well) and you allow the strike to move through you without stopping and attacking yourself to it. You might want to pay attention to your eyes by looking forward and up or by closing them at first to avoid tensing up out of fear and expectations of what you think might happen.