15th Round Boxing is a boxing gym in Sioux Falls built around serious technical instruction for both competitors and non-competitors. Founded in 2015, the gym trains professional and amateur fighters as well as adults and youth from age eight who come to boxing for fitness, discipline, and confidence. Coaching is grounded in state and national boxing certifications, years of amateur competition, and ring-tested experience, with an emphasis on fundamentals, repetition, refinement, and conditioning through authentic boxing training. The business expanded with a second gym in 2018 and launched 15th Round Promotions the same year, going on to stage dozens of boxing events featuring world champions. A broader background that includes Dutch-style Muay Thai further shapes the gym’s focus on sharp fundamentals, practical skill, and complete athletic development.