Final answer:
The instructor in water exercise is recommended to teach from the pool deck as it provides a clear view, safety monitoring, and effective demonstrations.
Step-by-step explanation:
The instructor in water exercise is recommended to teach from the pool deck because it provides several advantages. Firstly, being on the pool deck allows the instructor to have a clear view of the participants and provide proper guidance and instructions. Secondly, it enables the instructor to monitor the safety of the participants and quickly respond to any emergencies. Lastly, teaching from the pool deck allows the instructor to demonstrate exercises and movements effectively, as they have a stable surface to stand on.