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Denver Boxing, Kickboxing and Fitness For All Levels

Welcome to Black Twenty One, a place to build strength, skills, and confidence through boxing, Muay Thai, kickboxing, and more for personal growth. We aim for daily improvement, not perfection, and together we can become champions of ourselves.

  • Classes

    Build strength and endurance, learn self-defense, gain confidence and self-esteem, and make new friends.

    Class Descriptions

  • Coach

    Coach Alejandro Ayala has been competing and coaching in combat sports for 15+ years. Learn more about his approach to coaching.

    Meet Coach

  • Gym

    Learn more about the Denver based boxing gym, our location and contact information.

    Learn More

  • "I'm so grateful I found this place."

    I joined Black Twenty One a few years ago and have been so grateful that I found this place. This gym has beginners as well as those who have been doing it for years. Alejando teaches the correct technique and everyone is pushed to go beyond their limit.

  • "Alejandro is the best trainer I’ve ever had."

    I’d never done kickboxing before but am now sold on it. I don’t think I’ve ever done the same routine twice. His workouts are ever changing and addictive. I leave dripping sweat every time.

  • "10/10!"

    Been going here for almost a year, had no prior experience in boxing and kickboxing. Alejandro is a great coach, breaks everything down step by step and brings out the best in people. The quality, sense of community and belonging in this gym is undeniable. 10/10 would recommend.