"I think today more so than any other day was the biggest jump for me, knowing that I could go off the mound," Britton said. "I know it's not game speed, but you try to simulate that as much as you can. But being able to stop, plant, throw, run, touch first base, was big for me. … Just kind of eased into it first and then got a little bit, picked up the intensity a little bit. And then after we were done there, we went through a circuit of agilities with [strength coaches] Ryo [Naito] and Joe Hogarty, just kind of some other things that maybe I'd have to do coming off the mound.