After winning Oscars for their documentary work, filmmakers Elizabeth Chai Vasarhelyi and Jimmy Chin make their narrative feature debut with Nyad. The move to narrative fiction isn’t a monumental jump for the director duo, whose cinematic documentaries (among them Free Solo and The Rescue) play like nerve-shredding action thrillers and intense human dramas. Nor does Nyad’s subject — another extreme feat of human daring and endurance — make this feel a million miles away from their most famous works.

The most obvious departures from the directors’ documentary strengths — Nyad’s flashbacks and hallucination scenes, for example — do sometimes highlight their newness to narrative filmmaking, however. These scenes feel shallow and therefore disconnected from the movie’s otherwise deeper treatment of its subject, just as the performances dip into outsized cliches at times. Mostly, though, Nyad manages to float above the trap of trying too hard to be an inspirational sports drama thanks to its confrontation of Diana’s prickly personality. This flips the film’s perspective onto that of Diana’s team (including her coach and former girlfriend, played by Jodie Foster), who ultimately suffer the consequences of her stubbornness. That refusal to submit to hagiographic impulses gives the film a documentary-like edge of truth, making the rousing moments here feel genuinely earned.