Jed Lowrie is hoping to return to his first-half form. Not with just his bat, but his body.

The All-Star second baseman hasn’t fully recovered from his July 13 collision with right fielder Stephen Piscotty (leaving Lowrie with a lower left leg bruise and whiplash). Which explains his .145 batting average (10-for 69) since he got hurt. Lowrie’s season average has dipped from .289 to .265.

The good news for Lowrie and the A’s is that he has restarted his usual lower-body fitness work that he had to table.

“I got a genuine leg workout in today probably for the first time since the collision,” Lowrie said Wednesday. “It’s not going to happen overnight. Doing what I was doing at a high level with my sprint work, treadmill work and my lower-body workouts, and then you take three weeks where you’re not able to do those things, you’re not going to just jump right in to do what you were doing before.

“But I’m confident now that I won’t make it worse by doing the work. I’m confident enough to start building it back up.”

Wednesday provided positive signs. Lowrie had a key eighth-inning single (breaking his 0-for-15 funk) that sent Marcus Semien to third, and Semien scored the decisive run on a groundball. Lowrie also made a long run into right field to catch a pop-up for the game’s final out.

“It was nice to get the results today,” he said.

Manager Bob Melvin regularly monitors and communicates with Lowrie and said he has remained valuable despite the setback.

“He wants to play. He wants to be out there, especially with the position we’re in,” Melvin said. “Whether he’s 100 percent with his legs, probably not. But he’s still a really good option for us.”

John Shea is The San Francisco Chronicle’s national baseball writer.