MMA & Martial Arts Gym in Las Vegas, NV
Welcome to Tribe Vegas
Built on community and real coaching
Tribe Fitness & Martial Arts was built on a simple belief: everyone can experience the benefits of martial arts. Whether you want to get fit, learn self-defense, or compete at a high level, there is a place for you here.
Coaches Who Care
Our team is made up of highly experienced instructors who bring years of knowledge to every class. They focus on fundamentals, safety, and helping each student grow at their own pace.

Casey Milliken
Owner & Head Instructor

Ashley Milliken
Owner & Functional Fitness Coach

Amber Atkinson
Functional Fitness Coach

Robert Anderson
Adult Muay Thai Coach

Darren Branch
Adult Jiu Jitsu Coach

Roxanne Modafferi
Youth & Adult Jiu Jitsu Coach
Casey Milliken
Owner & Head Instructor
Casey started training Jiu Jitsu and Muay Thai in 2007. He moved to Las Vegas in 2009 and fought professional MMA across the country before earning his Jiu Jitsu black belt under Alexandre Almeida in 2017. Casey specializes in fundamental Jiu Jitsu while offering a fresh mix of old-school and new-school advanced techniques.
Ashley Milliken
Owner & Functional Fitness Coach
Ashley's journey into strength and conditioning changed the way she moves, trains, and lives. She has seen firsthand how thoughtful coaching and consistent support can unlock strength people never believed they had. Ashley is passionate about helping people build confidence through movement, guiding them with clarity, patience, and encouragement as they work toward goals that once felt out of reach.
Amber Atkinson
Functional Fitness Coach
Amber is a mom of six and a former collegiate track and field athlete at the University of Arizona, where she competed in multiple throwing events. She went on to coach strength and conditioning for the University of Arizona football program and several other varsity sports, then served as a throws coach at Bakersfield College and coached Las Vegas track and field athletes who went on to compete in college.
Today, Amber brings the same smart progression and intentional training to everyday people, helping them feel strong, capable, and confident in their bodies.
Robert Anderson
Adult Muay Thai Coach
Robb Anderson has been training in Muay Thai since 2007 and has competed professionally throughout his career. He brings years of real fight experience to his coaching while keeping his focus on clean technique, smart progression, and longevity in the sport.
Robb leads and supports his team in Muay Thai competitions, creating an environment that balances high standards with genuine care for his athletes. Known for fun, high-energy classes, he makes learning effective, engaging, and accessible for all levels.
Darren Branch
Adult Jiu Jitsu Coach
Darren has been training and competing in Jiu Jitsu since 2005.
Roxanne Modafferi
Youth & Adult Jiu Jitsu Coach
Roxanne, known as The Happy Warrior, is a UFC veteran and former top 10 ranked fighter. She is also a Jiu Jitsu black belt with an active competition history, including a win at the IBJJF Master World Championship at brown belt.
Our Training Space
Tribe Vegas is a world class MMA facility serving the local towns of Spring Valley, Summerlin, The Lakes. Our facility spans more than 5,000 square feet and is outfitted with top-quality mats and plenty of equipment, giving every class the room it needs to train hard and train safely.
Get to Know Tribe Vegas
Learn more about our gym, our coaches, and the community that makes Tribe Vegas feel like home.
Where is Tribe Vegas located?
We are in South Summerlin at 5752 S Fort Apache Rd, Suite 125, Las Vegas, NV 89148. Our members come from Summerlin South, Rhodes Ranch, Spring Valley, Mountain’s Edge, Southern Highlands, and across southwest Las Vegas.
Who owns Tribe Vegas?
Tribe Vegas is owned by Casey and Ashley Milliken. Casey is our head instructor, a Jiu Jitsu black belt under Alexandre Almeida and a former professional MMA fighter. Ashley leads our functional fitness program and is a CrossFit L1 Trainer and certified nutrition coach.
What programs do you offer?
We offer Brazilian Jiu Jitsu, Muay Thai, and Functional Fitness for adults and teens, plus youth Jiu Jitsu and Muay Thai classes starting at age 3. Private one-on-one training is also available.
Who will I be training with?
Our coaching team includes UFC veteran and Jiu Jitsu black belt Roxanne Modafferi, professional Muay Thai competitor Robert Anderson, and former collegiate strength and conditioning coach Amber Atkinson. Every coach brings real experience and a focus on teaching students at every level.
What is your training space like?
Our facility has more than 5,000 square feet of training space with top-quality mats and plenty of equipment. With over 50 classes each week, there is room and time for everyone to train.
Can my whole family train here?
Yes. We run youth and adult classes throughout the week, so parents and kids can often train at the same gym on the same day. Teens train alongside adults in our adult and teen classes.
Do you have a competition team?
Competing is completely optional, but the opportunity is there. Coach Robert Anderson leads and supports our athletes in Muay Thai and Jiu Jitsu (youth and adults) competitions, and many of our coaches have extensive competition experience to help you prepare.
Ready to Find Your Tribe?
Walking through the door is the hardest part. Take the first step today with a free trial and see why so many Las Vegas families and athletes call Tribe Vegas home.






