A shot of sprinklers watering green grass on the gridiron. A slow-mo replay of a tight spiral hurdling its way through the blue sky. A late-round draft pick sweating through the first wave of cuts.
For decades, these sights and sounds have unofficially marked the beginning of a new NFL season as the familiar scenes in HBO's annual hit docuseries Hard Knocks: Training Camp. That show will be back this summer to usher in another exciting season of NFL football.
