Grudge Training Center

Grudge Training Center (GTC) was a mixed martial arts training center founded by coach Trevor Wittman in 2009. Originally located in Wheat Ridge, Colorado, GTC relocated to Arvada, Colorado in 2013. The gym was an affiliate of Jackson's Submission Fighting. Wittman closed Grudge in November 2016. Notable fighters Rose Namajunas – Former 2x UFC Women's Strawweight Champion Nate Marquardt – UFC Pat Barry – UFC Justin Gaethje – UFC Former Interim Lightweight champion Brandon Girtz – Bellator Justin Salas – UFC Luke Caudillo – Strikeforce, UFC Tyler Stinson – Bellator, Strikeforce Brandon Thatch – UFC Justin Wren – Bellator Shane Carwin – Former UFC Interim Heavyweight champion Rashad Evans – UFC Hall of Famer Duane Ludwig – UFC Ed Herman – UFC Todd Duffee – UFC Melvin Guillard – UFC Brendan Schaub – runner-up on The Ultimate Fighter: Heavyweights Jon Jones – UFC Former Light-Heavyweight Champion Gerald Harris – WSOF John Howard – UFC Jared Hamman – UFC Tyler Toner – UFC James McSweeney – UFC Paul Buentello – Bellator, Shark Fights Cody Donovan – UFC Eliot Marshall – UFC Alvin Robinson – UFC Notable and recurring trainees under Trevor Wittman Stipe Miocic – UFC Former Heavyweight Champion Neil Magny – UFC Donald Cerrone – UFC Georges St-Pierre – Former UFC Welterweight & Middleweight Champion