"All running backs fumble, but as they say, iron sharpens iron, so just because you're good at something doesn't mean you can't get better at it," Turbin said.
With fumbles proving costly, NFL teams use beeping footballs to teach technique →
"Yeah, we usually win those," Turbin said with a grin. "We won every Wednesday this year except one, maybe two."
'Turnover Thursday' for Seahawks at practice →