Stryder said
But, why can Bardock?
I think he was in high atmosphere with extremely low levels of oxygen, it would explain how the people in dbz are able to fight in the air X3
Edit. also from watching vegeta vs shadow from death battle, apparently saiyans can hold there breath for a long time so it explains how goku and vegeta managed to hold their breath under water for as long as they did back in the freezer saga =3