Black Twenty One is a combat sports gym in Denver centered on direct, individualized instruction. Its training emphasizes practical, hands-on coaching in boxing and kickboxing, with sessions tailored to different experience levels and goals, from technical skill development to demanding full-body conditioning. Boxing is a core focus, including 45-minute heavy bag sessions built to improve real boxing ability, cardio, and endurance, along with technique-driven mitt work for refining timing, accuracy, and mechanics. Private training offers more personalized progression in boxing or kickboxing. The coaching approach draws on more than 15 years of experience across MMA, boxing, jiu jitsu, and kickboxing, supported by certifications and licenses in boxing, Muay Thai, personal training, and CPR. Black Twenty One combines disciplined fight training with a community-minded atmosphere focused on encouragement, progress, and mutual commitment.