She didn’t have to wait long. A head soon breached the water ever so briefly before dipping back down under the surface. This time Luna’s eyes followed the human shaped shadow under the dark water. It seems Celestia found an exercise the human could enjoy that was in a secluded place. Luna had to admire the idea, she had forgotten this room was even still here. And admittedly she just assumed the human couldn’t or didn’t like to swim. Ponykind wasn’t exactly known for their stellar aquatic abilities. It was more of a recreation involving parasols and floating rafts rather than a proper form of exercise. She had not thought to even ask the human if it held any interest.