He must get behind line of all throw-ins and, when standing to the fast bowler, be ready to move smartly up to the stumps. Both knees are fully bent to adopt a sitting down position.
Legs are astride.
The right foot is outside the off stump. The head is steady. The chin is up. The eyes are looking past the batsman for the ball as it leaves the bowler's hand. The backs of the hands touch the ground with the palms facing forward.