Valencia (hamstring) ran 12 30-yard sprints Thursday, and is also hitting off a pitching machine, Joe Stiglich of CSN California reports.
It was reported earlier in the week that Valencia was hitting off a tee and generally progressing well, and it seems he's successfully ramped up his activity in recent days. Valencia figures to ultimately head out on a short rehab assignment, before returning to the major league roster possibly as soon as May 6.