Kids Jiu Jitsu Instructor
Brown belt in Brazilian Jiu Jitsu with years of experience both on the mats and in the classroom. She spent over seven years as an elementary school teacher and has also taught youth jiu jitsu, giving her a deep understanding of how kids learn, grow, and build confidence.
Grey Marin is a brown belt in Brazilian Jiu Jitsu who brings substantial experience to her instructional role, combining martial arts expertise with formal education credentials. She previously worked as an elementary school educator for over seven years and has taught youth jiu jitsu, which informs her teaching methodology. Her background allows her to understand how kids learn, grow, and build confidence. She creates classroom environments that are engaging and enjoyable while maintaining high expectations for student focus and problem-solving abilities.
Her primary objective is helping young practitioners at all skill levels gain the discipline, confidence, and joy that jiu jitsu can bring.
Grey coaches at Ground Game Theory, a no-gi jiu jitsu academy in Westchester / University Park in Miami, five minutes from FIU. The academy is at 9766 SW 24th St, Unit 12, Miami, FL 33165 and runs adult no-gi classes, kids classes, and MMA, plus open mat and private lessons. The first day is free for Miami-area residents.
Our adult no-gi jiu jitsu program is split into three class types: foundations for beginners, all-levels for mixed experience, and advanced classes for competitors and serious practitioners. Students learn how to wrestle opponents to the ground, control positions, and finish submissions under pressure.
Explore adult no-gi→Our kids jiu jitsu classes help students build confidence, focus, discipline, and sportsmanship through structured, engaging training. Classes are welcoming, productive, and fun for children ages 4-12 in the Miami area.
Explore kids classes→Our MMA training classes combine striking, wrestling, and submission grappling in a structured and approachable environment. These sessions are ideal for students looking to develop practical mixed martial arts skills while improving conditioning and timing. MMA classes are offered Fridays and Sundays.
Explore MMA→Start your free one-day trial and experience the room for yourself.
