Matt Hasselbeck sits out practice

Quarterback Matt Hasselbeck wore a hat -- not a helmet -- to practice, sitting out his first workout of training camp. He spent the entire time on the field, indicating that it may have been nothing more significant than giving his arm a break since he wasn't receiving treatment.Left tackle Walter Jones was not on the field after leaving practice on Monday after it appeared his back was bothering him. No injury report has been provided.Other absences from Tuesday's morning practice: K Olindo Mare (knee), RB Julius Jones (undisclosed), CB Marcus Trufant (PUP, back), RB T.J. Duckett (undisclosed).A number of other players sat out practice after working out Monday afternoon, getting what is probably a day of rest: LB D.D. Lewis (knee), C Chris Spencer, WR Nate Burleson, WR Deion Branch and DE Cory Redding.DE Lawrence Jackson (groin) and G Grey Ruegamer (elbow) continued to sit out practice while OL Cory Withrow returned to the practice field.