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All eyes on you! A competitive swimmer is constantly evaluating their strokes—finding weaknesses and correcting them. If you have a swimming instructor they will also be evaluating you. Unfortunately, when walking back and forth in a pool (that others might be using) it might be hard to analyze a swimmer.
In comparison, the endless personal pool keeps the swimmer in one place so it's easy to monitor swimming technique. And, since it's made for only one person, you don't have to worry about others obstructing an instructor's view.