The turn will continue until he resumes the neutral position. Lowering one knee relative to the other accomplishes the same thing. Turns are also based on deflection of air. In the neutral position, equal amounts of air spill off both sides of the body. To turn right, our box man banks his arms, just as an airplane does in a turn.
More air flows off the left side, creating a right turn.
The rest of the body remains neutral. To stop the turn, simply return to neutral. Forward motion works on the same principle of deflection. To deflect more air to the rear, resulting in forward motion, bring your arms back a few inches and extend your legs. This tips your body slightly head down, air rushes back off your torso and legs, and you slide forward.