Arab News. DUBAI: Colby Covington is training with bigger wrestlers to prepare for Khamzat Chimaev’s size advantage and has vowed to “make him quit” when he defends his RAF cruiserweight crossover. Colby Covington has made a bold claim about a potential wrestling match against Khamzat Chimaev. The former UFC star believes his cardio and relentless pace would eventually break the former.