Eric Kolesar is a boxing, Muay Thai, and BJJ performance coach based in Everett, Washington, where he owns and heads coaching at K2 Boxing & Jiu Jitsu (operated under Sentinel Athletics LLC). He teaches structured, discipline-focused training for competitors and everyday students, emphasizing striking fundamentals alongside grappling. Public records tie him to gym leadership under the Sentinel/K2 banner, though details of prior CM Boxing/Sentinel Striking branding could not be independently confirmed.