"He looked better than I have ever seen at running or scrambling," Hasselbeck said. "It was like all the extra attention he's put in training and recovery showed up on the football field."
Turning 40: Brady showing few signs of decline at milestone →
Two-time Super Bowl champion Leonard Marshall and three-time Pro Bowl selection Matt Hasselbeck say they will donate their brains to the Concussion Legacy Foundation for research into chronic traumatic encephalopathy.
Leonard Marshall, Matt Hasselbeck pledge brains to research →