The narrative of the American sports hero is often one of perceived invulnerability, a story of grit and physical dominance that suggests the legends of the gridiron are somehow immune to the frailties that affect the rest of humanity. However, Terry Bradshaw, the four-time Super Bowl-winning quarterback for the Pittsburgh Steelers and a beloved fixture of Sunday morning television, recently shattered that illusion with a characteristic display of candor. In a move that has resonated far beyond the world of the NFL, Bradshaw disclosed that he has spent the past year engaged in a dual battle against two distinct forms…