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This is called the #pumpfoil. She is #pumpfoiling

You pump up and down with your legs and that motion alone is all that is necessary to translate via a hydrofoil under the water surface (like a wing) to give you lift and forward motion

You need good balance, endurance, and if you stop pumping you lose lift and sink rapidly

EDIT: this is Alina Kornelli. See @bruno 's comment below

EDITEDIT: https://youtube.com/@alinakornelli