Jim Harbaugh has earned the reputation of the ultimate program builder. After successful turnarounds with the San Francisco 49ers and his Michigan Wolverines, Harbaugh is on pace to do it again.

After being 2-2 at the bye week, the Chargers have won three of four — including two straight by at least 17 points — and are playing their best football of the season. The biggest reason for the Chargers' turnaround has been something that Harbaugh has preached from when he was hired as head coach on Jan. 24 — mental toughness.

Chargers head coach Jim Harbaugh said that Justin Herbert knocked him from the top spot as the toughest QB in NFL history, adding that no QB has been better than Herbert this season in an interview on "The Herd.