Miles Teller has built a screen career on looking like the job in front of him, whether that means a boxer in Bleed for This, a fighter pilot in Top Gun: Maverick or a highly skilled operative in The Gorge. Behind many of those transformations has been celebrity trainer Jason Walsh, who said he has worked with Teller for years and that the 39-year-old treats preparation as seriously as the roles themselves.
Walsh said Teller is steady with his diet whether a film is coming up or not, and that training helps keep him mentally balanced. That consistency has mattered in the most demanding roles. For Top Gun: Maverick, Teller had to gain 25 pounds while staying at single-digit body fat, then build a core strong enough to handle the extreme g-forces fighter pilots face. Walsh said the work included heavy lifting, including deadlifts over 450 pounds.
The regimen behind those results is built around Walsh’s preference for heavy compound lifts and Peripheral Heart Action training, which pairs upper- and lower-body movements. Teller’s preparation has not been limited to one project either. For The Gorge in 2025, he combined sniper training with four gym sessions per week, a schedule that pushed him through what he later described as a very physically demanding shoot. He said stunt coordinators and stunt teams helped, but the physical work still had to be done.
Walsh has also shared a high-volume workout in Men's Journal designed to get Teller screen-ready, underscoring how methodical the process has become. The through line is not a single dramatic bulk or cut, but a pattern of steady work that Walsh says Teller understands as long-term maintenance, not short-term image management. That is what makes the transformations believable on screen: they are repeated, disciplined and already in motion before the cameras start rolling.
The next test is whether Teller can keep matching that standard as his roles keep shifting, because the method Walsh describes depends less on one big transformation than on the willingness to keep showing up for the next one.
