Starting by sitting at the finish, take 10 arms only strokes. Then move to 10 arms and body strokes. Then 10 strokes at half-slide. And finally 10 full strokes. Make sure rowers keep good posture during each phase, especially not moving their bodies on arms only strokes.
Progression
The number of strokes at each position can be altered (perhaps moving it to 20), or each phase can be continued until the coach is satisfied that the technique is good.
Note
To ensure the boat is set during this drill, in larger boats, have rowers sit out with their blades flat on the water to help balance.