The word ‘cowboy’ is fraught with imagery — boots, horses and ubiquitous white men roaming the Wild West. The Fletcher Street Urban Riding Club, Black cowboys clad in Air Jordans riding up and down the streets of North Philadelphia, don’t quite fit that mold. They’re the real-life subjects of “Concrete Cowboy,” which aired on Netflix April 2. “Concrete Cowboy” stars familiar faces like Idris Elba and Caleb McLaughlin of “Stranger Things,” but it also features real members of the riding club, a non-profit organization that aims to care for and ride horses in an urban area. It provides mentoring and training services to youth in the community.