NASHVILLE, Tenn. (AP) — Call it looking on the bright side or being an optimist. Then again, Chris Johnson has a point. Surely, the Tennessee Titans' ground game can only get better since it's already the worst in the NFL. The man who led the NFL in yards rushing during his first three seasons now is tied for 34th in the league this season after signing a $53.5 million extension with $30 million guaranteed.