SAN FRANCISCO -- Buster Posey has resumed physical activities and Giants manager Bruce Bochy remains optimistic that the Giants' Gold Glove catcher will come off the seven-day concussion list when first eligible.
"Yeah, I am, but that's me," Bochy said prior to Thursday's game against the Colorado Rockies at AT&T Park. "I try to stay optimistic. I can't say it's going to be the case but I'm being optimistic."
Posey has been out since Monday when he was hit in the head by a 94 mph fastball from Arizona pitcher Taijuan Walker. Although he said he felt fine that night and was able to drive himself home, Posey began experiencing symptoms associated with concussions the following morning and was placed on the disabled list.

The Giants initially wanted to give Posey a few days to rest but scrapped those plans when Posey began feeling better more quickly than anticipated.
"He did some yesterday, we're going to increase it today," Bochy said Thursday. "He'll do some cardio and a little lifting today. He's feeling good. I just finished talking to him and he's doing well. We're going to ramp it up a little bit and see how he does.
"It's good to see him doing well. You never know with these things. Right now he's progressing like we had hoped."
Tim Federowicz, called up from Triple-A Sacramento when Posey was placed on the concussion list, was scheduled to start Thursday against Colorado. Nick Hundley, who signed with San Francisco in the offseason, had started each of the past two games.
Crawford a late arrival: Shortstop Brandon Crawford was not in the starting lineup after leaving the team to be with his family following the death of his sister-in-law, although he was expected to arrive at AT&T Park before the game.
The Giants offered no details and said Crawford was dealing with a family emergency. Crawford's wife, Jalynne, posted on Instagram that her sister had passed away.
"He's not in the lineup but he will be here for the game," Bochy said. "That's all I can give you right now. I'll talk to Brandon once he gets here but he'll be here for the game."
Bochy said he was notified of the situation by head athletic trainer Dave Groeschner late Wednesday night.