Eagles OT Jason Peters was lined up at left tackle yesterday, for the first time in this camp, after suffering what the team called a "quad spasm" in Thursday's conditioning run. "It felt good to get back out there with my teammates and get some reps," Peters said. Peters, the offseason's biggest acquisition, said watching the first 2 days of full-squad workouts was difficult. "It was frustrating, watching those guys sweat and grind and get into training-camp shape," he said. "It was real hard for me; I've been over with Rick [Burkholder, the head athletic trainer], running and doing different exercises with him, but I'm glad to be back . . . From 1 to 10, it's about an 8, 8 1/2." With Peters returning, left guard Todd Herremans, who had been filling in at left tackle, worked in some at right tackle, where Shawn Andrews remains sidelined with back stiffness.