"Yeah, funny thing, the swimming won't actually move you anywhere," Jack grinned up at him, "It's good for directional changes but not momentum. Try a somersault. That's how you move in zero gee. Once you get momentum, you can keep going. Hard to stop, though. Right now, you're not really in zero gee, you just kind of are zero gee. Your mass changed, not the gravity around you. Way harder to move because you're still fighting the weight of the air around you."