Personal trainers have been a part of professional sports for decades. Personal data analysts are newer.

As a trained mathematician, Justin Zormelo provided Kevin Durant of the Oklahoma City Thunder with personalized analytics during Durant’s MVP season. And in his most recent undertaking, Zormelo is training a 17-year-old, 7-foot-1-inch Sudan native named Thon Maker. Zormelo’s story is told in the latest “Signals” film from FiveThirtyEight and ESPN Films: “By The Numb3rs (With Justin Zormelo),” directed by Jamie Schutz.