B
Black Twenty One
Empower Your Grit. Transform Your Life Through Boxing.
5(5 reviews)
$$
doctor
boxing
martial-arts
About Black Twenty One
Black Twenty One is a premier boxing and kickboxing gym in Denver, offering expert coaching in a welcoming, community-focused environment. Led by passionate instructors like Alejandro and Mike, we cater to all skill levels—from beginners seeking a great workout to competitive fighters honing their skills. Our small classes ensure personalized attention, fostering growth, confidence, and a strong sense of belonging. Whether you're looking to improve fitness, learn fundamentals, or compete, we provide a judgment-free zone where everyone can thrive.
Business Info
Location
1870 S Acoma St, Denver, CO 80223, USA
Services Offered
Boxing Classes
Structured group sessions focusing on technique, combos, and conditioning for all levels.
Kickboxing Training
Dynamic workouts blending boxing and kicking techniques to enhance agility and strength.
Personal Coaching
One-on-one attention from experienced coaches for individualized skill development and goal-setting.
Fight Preparation
Corner support and tailored training for competitive fighters preparing for matches.
Beginner Fundamentals
Patient instruction for newcomers to learn proper form and build confidence in a supportive environment.
Community Events
Engaging activities that foster camaraderie and a motivating atmosphere among members.
Reviews
5(5 reviews)
Rating Distribution
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Grant Johnson
via Google
3 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.
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Ryann Dominguezvia Google
3 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!
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David Wexlervia Google
8 months 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
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Stephanie Rodriguezvia Google
about 1 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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Katrina Ashleyvia Google
over 2 years ago
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.
