I remember the time in my life I was most obsessed with exercise. At 20 years old, home in Los Angeles for the baseball off season, I was at the peak of my training. It was January and I always started to feel like I wasn’t prepared for the upcoming season at precisely this time. I lifted weights in the morning, then headed to the field to throw, take swings and run in the afternoon. I pushed myself to the point of exhaustion, usually crashing in the early evening. My brain hadn’t developed as much as my body; I…