Trevor Wittman

The boxing background

Trevor Wittman entered combat sports as a professional boxer in the late 1990s, training out of Colorado-area boxing gyms before transitioning to corner work full-time in the early 2000s. His amateur and early-pro boxing record was unremarkable, but the technical fluency he developed during his competitive years became the foundation of his coaching identity. By 2005 he was working corners for Verno Phillips and Stevie Forbes — both world-title-level boxers — and had begun integrating boxing fundamentals into the developmental program at the gym that would later become Grudge Training Center in Wheat Ridge, Colorado.

The transition from boxing-only corner work to MMA coaching happened gradually through 2008–2012 as Colorado-based MMA fighters (notably Brendan Schaub and Shane Carwin) brought him into their camps for striking-specific work. By 2013, Wittman was operating as a full-time MMA striking coach.

The Onnit / Grudge / ONX era

Wittman operates primarily out of Grudge Training Center in Wheat Ridge, Colorado. The Colorado altitude (roughly 5,400 ft elevation) plus the resident strength-and-conditioning program produces a championship-ready athlete profile — fighters who train in Wheat Ridge for camps typically arrive at sea-level venues with a noticeable cardio advantage in the championship rounds.

He previously operated through an Onnit-sponsored facility (the partnership ended in the late 2010s) and now runs the ONX Sports brand, which produces fight-specific equipment including the ONX boxing gloves designed as a response to the eye-poke and finger-bone-strike issues with traditional UFC gloves. ONX gloves became a standard equipment recommendation in MMA striking communities by 2022.

The athletes

• Kamaru Usman — UFC welterweight champion 2019–2022 with five title defenses. The Usman striking evolution under Wittman is the canonical case study: Usman entered the welterweight title picture as a wrestling-base fighter with a serviceable jab; by UFC 261 (April 2021) he was a one-shot KO threat, finishing Jorge Masvidal with a clean right hand from open stance — the most-televised single-strike KO of Wittman's coaching career.
• Justin Gaethje — UFC interim lightweight champion (UFC 249) and BMF champion (briefly, before the UFC 300 loss to Holloway). The calf-kick attack that defined Gaethje's post-2018 stretch was a Wittman development — Gaethje had previously thrown leg kicks as a closing weapon; Wittman restructured the attack around the calf-kick as a fight-opener and pace-setter.
• Rose Namajunas — UFC women's strawweight champion (2017–2018, 2021–2022). The karate-distance striking that produced the round-1 head-kick KO of Zhang Weili at UFC 261 was Wittman's most-cited tactical setup of the women's-division era.
• Nate Marquardt (formerly) — UFC middleweight contender across the late-2000s and 2010s.
• Eryk Anders, Karl Roberson, Cory Sandhagen (camp-only or short-term) — UFC contenders who have used Wittman for camp-specific striking work.

The coaching philosophy

Wittman's coaching emphasizes four principles, applied across every athlete in his program:

Fundamentals over flash. Textbook jab, cross, hook, footwork, and head movement before any novelty technique. Wittman has publicly stated he refuses to teach spinning attacks to fighters whose basic combinations haven't been internalized to the point of being a reflex.

Power development over time. Extended training cycles (12–18 months) to develop one-punch KO capability. The Usman right hand (UFC 261), the Gaethje overhand (UFC 254 vs Khabib), and the Namajunas head kick (UFC 261) are all results of multi-camp power development arcs, not single-camp adjustments.

Defensive precision. Head movement and counter-striking timing as the foundation, not the auxiliary. Wittman's fighters are typically not the most-aggressive in any given matchup; they are the most-defensively-stable, which produces the late-round openings that lead to finishes.

Calm corner management. Wittman's corner work is famously calm and instructive, contrasting sharply with louder MMA corner styles. The audio of his between-rounds instructions (publicly released for the UFC 261 Usman-Masvidal fight) became a coaching template for younger MMA strikers' corners — single-sentence reads, no shouting, specific adjustments delivered in 15-second windows.

Signature corner moments

• UFC 261, Usman vs Masvidal, April 2021: between rounds 1 and 2, Wittman instructed Usman to "let the right hand go on the next exchange when he stops moving" — Usman landed the finishing right in round 2 against a stationary Masvidal.
• UFC 249, Gaethje vs Ferguson, May 2020: Wittman's instruction between rounds 2 and 3 ("the calf kick is hurting him, double up on it") preceded the round-3 calf kick sequence that produced the visible Ferguson hobble and set up the round-5 TKO.
• UFC 261, Namajunas vs Zhang Weili 1, April 2021: Wittman's pre-fight instruction was that the head kick would be there in the first 90 seconds if Zhang committed to a level change. Namajunas landed the head kick at 78 seconds for the round-1 KO.

The legacy

Trevor Wittman is the most-credentialed striking coach of the 2018–2024 era in MMA. The Usman welterweight title reign, Gaethje's interim lightweight + BMF titles, and Namajunas's two strawweight reigns combine to a championship-credential portfolio comparable to Eugene Bareman's at City Kickboxing or Henri Hooft's at Sanford MMA — and arguably ahead of either, by total title-defense count.

His coaching style — fundamentals-first with patience, calm corner management, and defensive-stability as the foundation — has been openly cited as an influence by the next generation of MMA striking coaches, including several younger Sanford MMA, City Kickboxing, and ATT striking coaches who have studied his between-rounds audio.