 I could barely think. Do you worry now what damage you did to your brain with all those concussions? Definitely. There was like a point where like, what I talked about in the book, where I would lose my keys or my phone and I would start crying. Let's put them in here. Look. She says that fear of losing her memories has taught her to live more in the moment. Rousey first started fighting when she was a kid, the daughter of judo world champion Anne Maria DeMars.