Three winters ago, Doc Rivers was ready to be done. He was throwing up constantly. His energy evaporated. Pounds dropped off his body. Rivers needed to get IVs before he coached the Clippers. He no longer looked like the tough-as-hell guard who made a name for himself on defense. He looked frail. And tired. And miserable. “It was awful,” he said. “That was a tough stretch. I almost thought about quitting because I had no energy. … And I thought it definitely affected my day-to-day ability to coach — and to live. You’re always tired. This job is tiring. And then you’re sick on top of it. I didn’t do any favors for myself.”