SANTA CLARA, Calif. (AP) -- If Vernon Davis stays after practice to push the weighted sled, Delanie Walker is usually right there with him.
They both were among the last 49ers players to leave the field following Thursday's practice. San Francisco's talented tight end tandem came into the league together in 2006, and these two have fueled each other through six NFL seasons.
While much of the focus this offseason has been on the NFC West champions' upgrades in the receiving corps with new additions Randy Moss and Mario Manningham, Davis and Walker hope to build off a special thing they established last year.
Davis had 67 catches for 792 yards and six touchdowns, while the versatile Walker made 19 receptions for 198 yards and three TDs before suffering a broken jaw.