My girlfriend is a pro figure skater. She watched me teach the trim, buoyancy, and propulsion dog & pony show several times then asked me to explain the skills to her. I kid you not. She did every skill underwater in a hotel pool holding her breath and hovering neutral wearing a facemask and a 3mm wetsuit without weight ... flutter, mod flutter, shuffle, frog, mod frog, backward kick, helo turns. On the turns she turned her head and body into the turn rather than remaining straight. Other than that, she did a great job! She did each one at a time not all in one breath hold. But, it showed her ability to process how her body moves far better than the average person. In scuba, she can't do it. She's not comfy in scuba. She is afraid of it. She enjoys freediving.