When I was a kid, I took horseback riding lessons with my older sister. It was fun. Our instructor liked making us switch mounts halfway through the lessons, so we would learn how different ones moved, learn to adjust. My sister never liked this. No two horses were exactly the same height; different legs, different carriage, different energy. To me, it didn't matter. Off one horse, on the other, picking up the gait and cadence of their stride without missing a beat. "How do you do that?" she wanted to know. And I'd just shrug. I had no idea. I just did it.