In physical therapy, I was not even lifting weights yet, just lifting my legs. This was exhausting and humiliating. My brain was fine, but I did not feel like myself. My body was frail and weak—the person who could run half marathons was a distant memory—and that, too, shapes your identity. Racking back pain can mold an identity; fatigue and nausea can, as well. Karen, my PT, asked me what my goals were. I picked two: riding my bike and going for a run. In the face of weakness, determination set in. Day after day I kept at it, and every tiny increase in strength broadened the possible worlds,
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