Mary waddled into her living room to sit down. As she did, she felt a strange sensation in her belly, as though it were pushing upwards. With a yelp, she realized that's exactly what it was doing! She felt herself being lifted ever so slightly, standing on tiptoe like a ballerina and waving her arms awkwardly. Her belly wasn't filled with air, but something lighter than air.
Hmm...lighter than air...a thought came to Mary's mind. Bending her knees as best as she could, she jumped, and watched the floor sink slowly away from her as she floated upwards. Mary squealed with delight as she slowly ruse to just below the ceiling, hovered momentarily, and settled back down to the floor as gently as a snowflake. Again, she pushed herself off the floor, blissfully doing a midair pirouette before gracefully landing on tiptoe. She could do this all day.