All five Niners linemen weigh over 315 and move well as run - blockers , especially Joe Staley and Mike Iupati on the left side .
Stopping San Francisco 's run game hinges largely on the simple idea of winning in the trenches .
All five San Francisco linemen weigh over 315 and move well as run - blockers , especially Joe Staley and Mike Iupati on the left side .
Stopping San Francisco 's run game hinges largely on the simple idea of winning in the trenches .