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Jeff J.

Jeff J is a retired Gunnery Sgt. with the United States Marine Corps and a former Federal Police officer. He was involved with extensive training with weapons systems, and hand to hand combat, mentored and trained hundreds of Marines in high-level fitness programs.

Boxing and mixed martial arts (MMA) are two of the most popular combat sports in the world. With decades of tradition, Boxing is a much older sport and more accepted around the world.  But in spite of being a newer sport, MMA has been rising at a high rate over the last two decades. It …

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