Chris Carpenter (shoulder) is ''regaining strength'' but remains without a timetable to resume throwing. "I feel like my arm is stronger," Carpenter said. "I'm regaining strength. I just don't know when I'm going to pitch." Carpenter, 37, continues to work in an exercise program, but doesn't appear close to a return. The Cardinals' medical staff will wait until he reaches pre-injury levels before clearing him to pick up a baseball.