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Black Twenty One
5 ★★★★★ 29 Google reviews · Muay thai gym in Denver, Colorado
Plan your first class
- Free trial or intro class most gyms welcome new members with a free trial or intro class — check their site or give them a call to book your first session
- Beginner-friendly all levels welcome, including total beginners — you don't need to be fit or have any experience to start
- Kids & youth classes kids and youth muay thai classes — built around discipline, focus, and confidence
- Fitness & conditioning muay thai fitness and cardio classes — a serious workout you can do without ever having to spar
- Fight team a competition team for members who want to test themselves as amateur fighters
- Today see hours ·
- Website & schedule blacktwentyone.com — book classes and see the live schedule
- Phone +1 720-935-1872
Hours
| Monday | 5:45–8 am, 5:30–8 pm |
| Tuesday | 5–8 pm |
| Wednesday | 5:30–9 am, 5:30–8 pm |
| Thursday | 5:30–7:30 pm |
| Friday | 5:30 am–12 pm |
| Saturday | 7:30 am–1 pm |
| Sunday | Closed |
The classes they run
“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.”
“If you want to lose weight, get fit or actual learn to fight (boxing and/or kickboxing) this is the gym for you!”
“Whether you’re looking to compete or just get in shape, I highly recommend Coach Alejandro and his gym.”
“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.”
Other martial arts here
“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 level of instruction in both boxing and kickboxing is top-notch you truly learn proper technique, from solid offensive combinations to strong defensive fundamentals.”
What members say
“Alejandro is a great coach, breaks everything down step by step and brings out the best in people.”
“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.”
“Alejandro was great, the others in the class were super friendly and it wasn’t intimidating at all.”
“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.”
“You will leave confident and sweaty, like every great workout should leave you.”
“If you want to lose weight, get fit or actual learn to fight (boxing and/or kickboxing) this is the gym for you!”
From the reviews
I’ve been going here for a year. I’ve improved my stretching, balancing, hand / eye coordination, core strength and most importantly, my confidence and physique in boxing. I also take private lifting / boxing sessions to improve my footwork, speed, and power. Incredible community.
I’ve been a part of many gyms and been to many work out classes but this one takes the cake. Alejandro has done an incredible job of creating a fun safe environment to learn and grow as well as a place to push yourself without being afraid to fail.
Highly recommend! In a sea full of outrageous prices, this one stands out. Incredible rates and intense & doable workouts (for all levels of fitness). If you want to lose weight, get fit or actual learn to fight (boxing and/or kickboxing) this is the gym for you!! Alejandro always brings it, every class.
Alejandro is the best trainer I’ve ever had. I’d never done kickboxing before. I can now say I’m sold for life. I don’t think I’ve ever done the same routine twice. His workouts are ever changing and completely addictive. I literally leave there dripping sweat every time.
New to muay thai? Start at Black Twenty One
Black Twenty One comes up as a beginner-friendly gym — noted on their own site. If you've never thrown a punch or a kick, that's exactly who a good beginners program is for. A few things worth knowing before your first week. First, you don't need to be fit to start — you get in shape by training, not before it, and coaches scale the conditioning to you. Second, you won't be thrown into sparring — reputable gyms build fundamentals (stance, footwork, and the basic strikes of the "art of eight limbs") for weeks before any contact, and sparring stays optional. Third, all levels really are welcome — ask about a dedicated beginners or fundamentals class time so your first session is alongside others who are also starting out. Most gyms are happy to let you watch or try a class first, so reach out before you commit.
Your first muay thai class at Black Twenty One
Nervous about walking into a muay thai gym for the first time? Almost everyone is, and good coaches expect beginners to come through the door. Here's what to know. What to expect: a typical first class is a warm-up, then drilling the basics on pads and bags — not fighting. Rest whenever you need to; no one will bat an eye. What to wear: shorts or athletic wear and a t-shirt; you'll train barefoot on the mats. What to bring: water and hand wraps if you have them — many gyms lend gloves for a first class, so it's worth asking when you call. As you keep training you'll add your own gloves, wraps, a mouthguard, and shin guards. Sparring is optional and comes later, once your fundamentals are solid. Arrive 10–15 minutes early to sign a waiver and meet the coach. It gets easier fast — most people feel far more at home by their third class.
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