I'll take a big [breath] at the beginning through my nose and then take [the bar] out. I don't want to let it all out because... you're actually loosening up... You want to keep it locked in. So as you walk back you're letting out a little bit of air and then getting more in. Just enough to do the exercise itself and you don't want to take in too much of it through the mouth because you're not filling up your lungs well.