Last season saw Brown struggle through a concussion in training camp and symptoms tied to his sickle-cell trait, which created moments of deep fatigue for the receiver.
This offseason, doctors also detected and treated a cyst on Brown's spine, which has made a vast difference for the pass-catcher, who said: "Twenty-four hours after they drained the cyst I was feeling normal. After a week or two, going back home and I was running around ... I just realized I was feeling real good."
"He just has a different energy about him," Palmer said. "He's heavier, he's stronger. He looks more explosive than he did last year. He's got that smile. He's having fun, enjoying it. It's not a grind."
This time around, the arrow is pointing up.