A bow wave is created by your body when you swim, this drops the level of the surface of the water as it passes your head, creating what we call a trough. You can breathe into that trough without lifting your head.
A bow wave is created by your body when you swim, this drops the level of the surface of the water as it passes your head, creating what we call a trough. You can breathe into that trough without lifting your head.