“If you made sure to push back enough so it went down gently rather than bouncing, then you'd have all of the energy that was used to lift the heavy thing up. That's the simplest way to use a waterfall, actually — fill a big bucket at the top and then lower it down.”
He demonstrates on himself, walking around while the glass covers his body like an extra layer of clothes. His head is still exposed, and the glass has gaps and arrays of holes in it in various places, which experience will quickly show are needed to reduce the feeling of being in a personalized greenhouse while exercising.
He does the same kinds of things and adds more for her to follow along with if she wants to. Assorted silly walks. Arms all directions. Stretches. What might be a yoga routine if he ever held a pose still.
But if she wants, she can use just those new muscles and let her arms and legs be pulled along by the glass — until she runs out of stored energy and has to work just with real muscles.
Eventually he stops leading, and stops moving, and waits for her.
“Now that you have practiced the motions of your body, it is safe for you to claim it.”
“You could still give yourself weird bruises if you tried. The difference now is that you aren't going to do it by accident because you know what is a normal kind of motion now.”
He demonstrates by rising off the ground a few feet.
“You can reinforce yourself to prevent injury.”
He hits himself on the head with a piece of glass. It goes clank.
“And you can move yourself using stored energy rather than your muscles. That's a bad habit, though, because you want to keep your muscles fit and adding to your stored energy instead.
“Want me to show off a bit?”
Now he's flying without benefit of wings, like the beach is a racetrack and he's doing his qualifying lap.
Back in front of her, he makes as if to jump — and he's a speck in the sky.
Now he's falling down again, head first.
A complimentary glass wall to catch the spray of sand has been provided for the comfort of spectators.
He takes a bow while buried up to his hips.
“Yep! You can't go completely rigid like I did for that all the time or you wouldn't be able to move, or breathe, but you can do a gentler reinforcement that you keep up all the time.”