Conductor James Levine says he’ll use the next several months in rehab from his rotator cuff injury to exercise and improve his diet. “I’ve got three months to recover from this,” he said. “I’ve never had a period in which I’ve had to do rehab and put my mind to correcting this, in my diet and exercise.” He said his busy schedule of rehearsing and leading performances meant he never had a base line with which to judge his physical state.