Updated

Pittsburgh Steelers running back Le'Veon Bell isn't worried about a tweaked hamstring slowing him down at training camp.

Bell sat out Monday's first padded practice as a precaution after feeling a twinge in his hamstring on Sunday. He insists it won't be an issue going forward as he tries to improve on one of the best rookie seasons in team history.

Despite missing the first three games with a foot injury, Bell had 1,259 total yards in 2013, breaking Hall of Famer Franco Harris' rookie record set more than 40 years ago.

The 22-year-old gave himself a "C-plus" grade and expects to be better this fall. He spent the offseason focusing on his footwork hoping to be more decisive in his cuts going forward.