The sun is just rising behind the concrete skyline, jutting above and reflected in the lake in front of us, and my teacher asks whether I’ve done tai chi before. About twenty years ago. Do you remember what kind? She lists some options but I’m not sure. She nods and goes around the small circle, eight of us. Today we’re learning the Chen style. We start with our feet solid in the earth, bent knees, arms soft. Like you’re hugging a tree.