It seems like yesterday, I was planning my first career:  I’m in the bathtub rolling from back to belly and back again; water is up to my chin. With each roll, the water splashes as far up the side of the tub as it can, without spilling over onto the floor. I crawl backward as far as I can, scrunch my long legs up, then push forward, going the entire length of the tub back and forth in rapid succession, until finally forcing water up the walls and onto the rug. My little sister is being dried off because I can’t do the routine with both of us still in…