cox must be able to take the crew through a technical and physical warm-up so that the coach is presented with a crew which is able to start the training program and has recapped any points that the coach has been emphasising in previous outings. It is essential that the coach and the cox work in good harmony and show respect to each other all the time. It is also essential that the cox is briefed on what the coach wants to achieve in the outing from the point of view of building physical fitness, technical skill, and team spirit. A cox must be positive, a good motivator and very encouraging. While errors must be spotted and corrected, it is also important to catch someone getting it right where they have been struggling. Steering the vessel Rowing boats are designed for speed, not maneuverability, so steering requires effort. Coxswains may steer with either the tiller (a cable connected to the rudder), commands for increased "pressure" or strength from rowers on one side of the boat, or both, depending on what is necessary in the situation. In the most extreme cases, the coxswain may go "full tiller", turning the rudder to its maximum angle, and may enlist the rowers to help the boat turn faster. This technique is usually reserved for only the sharpest turns, as the sharp angle of the rudder increases drag and upsets the balance of the boat. For more conventional turns, the coxswain may move the tiller slightly to one side or the other over the course of a few strokes. To minimize disturbance of the boat's stability, the motion of the tiller must be smooth and not sudden. The coxswain may also initiate the turn during the drive phase of the stroke, when the propulsive force of the oar blades in the water helps stabilize the boat. For very small steering adjustments, the coxswain may move the tiller very subtly during the recovery phase of a single stroke. This technique is most effective at higher speeds and on straight courses, and must be used sparingly as motion of the tiller during the recovery can easily disturb the boat's balance. Some coxswains advocate that the rudder should be applied only during the drive phase (and centered during the recovery phase), citing the fact that the boat is most stable when the oars are in the water and