Black Twenty One

Black Twenty One

Denver, Colorado | 5.0
5.0 (29 reviews)

Black Twenty One is a boxing gym located in Denver, Colorado. Specializing in Traditional Boxing. Rated 5.0 out of 5 by community members.

Reviews

Marion Brown
Marion Brown 3 months ago

I’ve been training at Black Twenty for over two years now, and I can confidently say it’s an outstanding gym. The level of instruction in both boxing and kickboxing is top-notch you truly learn proper technique, from solid offensive combinations to strong defensive fundamentals. The coaching is what really sets this place apart. The owner is not only knowledgeable and patient, but he also knows how to push you to improve every single day. He takes the time to make sure you understand the fundamentals while still challenging you to grow. Beyond the training, the atmosphere feels supportive and genuine. It’s the kind of place where people look out for each other. In fact, the owner once even helped me change a flat tire something he absolutely didn’t have to do, but it shows the kind of person he is. If you’re looking for a gym that builds skill, discipline, and community, Black Twenty is the place to be.

Owner Response · 2026-02-27T14:49:50.000Z

Thank you for the review and the confidence entrusted to this gym. Much appreciation sir🙏🏽

Grant Johnson
Grant Johnson Local Guide 6 months ago

Alejandro and Mike are passionate about helping you reach your goals whether that's to win a fight or just learn the fundamentals of boxing while getting a great workout in. This gym is a judgement free zone where anyone from experts to beginners can feel comfortable. I had zero prior boxing experience and I have found a hobby I plan to do for the rest of my life. The classes are small enough that you will always get some individual coaching and attention. The prices are fair and the instruction / experience is very worth it.

Ryann Dominguez
Ryann Dominguez 6 months ago

This place helped me get my GRIT back during a really hard season of my life. Alejandro is not just an instructor, but a coach. Working with everyone individually at their own levels but keeping a strong foundation of the flow of class. I leave every class feeling empowered and like I won the day! Happy to be part of this community they are building at Black Twenty One. If you're looking for a true boxing experience, look no further. This is it!

Owner Response · 2025-10-31T20:50:56.000Z

Thank you! Humbled to be apart of your journey🙏🏽. (Keep your hands up)

David Wexler
David Wexler Local Guide a year ago

I’ve been attending classes here for about a month, and I Iove it. I am older and have always been intrigued by boxing and felt like I needed a workout to help with my reflexes and agility. This has been the perfect fit. It’s no nonsense. Just hard work at a fast pace. Alejandro is very patient especially with someone like me who had no experience and who might take a little longer to learn the proper technique and correct combinations. Highly recommend checking this place out

Owner Response · 2025-06-03T12:18:48.000Z

Thank you sir 🙏🏽

Stephanie Rodriguez
Stephanie Rodriguez a year ago

I’ve trained with Coach Alejandro for a few years, and my boxing and kickboxing skills have improved immensely. He’s cornered me for multiple fights, always bringing a calm and supportive presence. His classes are perfect for all levels—he’s patient, breaks down techniques, and makes sure everyone understands the combos. The gym has a great, welcoming atmosphere with a strong sense of community, making it easy to feel comfortable, even as a beginner. Whether you’re looking to compete or just get in shape, I highly recommend Coach Alejandro and his gym. The environment is motivating, and the personal attention he gives to each student sets him apart from other trainers.

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