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"Don't count the days...Make the days count" - Muhammad Ali

Workout Lesson



The 12th Round Fit training program is run by Marty Barrett and his team of both boxing and fitness trainers. Their ultimate goal is to improve people's health and help them reach their fitness goals.

Utilizing next generation boxing and fitness techniques, our trainers teach, train, and condition Professional athletes to hone in on their sport specific skills and conditioning needs.

We understand that not everyone wants to be a professional athlete or even a heavyweight champion of the world, but you will be trained like one. 

If you are looking for a community that will push you to your limits so that you can be the very best version of yourself, ditch the warehouse gym and be the next 12th Round Fit success story.


Group Classes

Want to workout but not sure where to start? Our Group Classes are a great opportunity to get in the gym and get a great high intensity workout with a trainer.

Our Elite Trainers will work 1-on1 with you to help you meet any of your needs along your fitness journey. 

Personal Training


The modern version of the classic boxing training is combined with interval training for an high intensity total body workout.

Sport Specific

Our Elite Trainers can help you as an athlete to increase your efficiency and enhance your performance.

Kids Classes

Get your kids moving with the fun quick -paced workout.  Out trainers can modify for any level.

Parkinson's Classes

Training delivered by experienced boxers who are in your corner as you go the distance and knockout Parkinson's! Classes are held M/W/F at 9am.

Upcoming Events

  • Women's Self Defense Workshop
    Sat, Oct 15
    12th Round Fit
    Oct 15, 2022, 9:00 AM – 12:00 PM MST
    12th Round Fit, 2954 N Hayden Rd, Scottsdale, AZ 85257, USA
    12th Round Fit's self-defense workshop is a comprehensive course that begins with awareness, prevention, risk reduction, and avoidance while progressing onto the basics of hands-on defense training. This is not a martial arts program. We teach people how to protect themselves from violence.

Get in Touch

2954 N Hayden Rd

Scottsdale AZ 85251


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Started at 12th Round Fit in January 2020 following my 4th NFL season. I was looking for a conditioning alternative after struggling to maintain weight. What I found was so much more, not only did I get in great shape, I've played my best ball since. Marty and the squad do an incredible job of creating a family atmosphere but also holding you accountable to your own goals. I am forever grateful to have walked in the gym on a Tuesday morning in Scottsdale.  Since that day, it's been part of my daily and off-season routine not only to box but to learn life lessons from the wisdom of Marty and Pete.  I look forward to every off-season from here on out being spent at 12th Round Fit where I become limitless.

Maliek Collins - NFL Defensive Tackle


I'm thankful to Marty and 12th Round Fit for providing a space for competitive athletes and retired competitive athletes to come together to train, teach, and tussle!

Hazma Abdulah - Retired NFL Player


12th Round Fit has been a great spot to train the past three years during NFL off-season.  Marty and his staff are a unique group.  Not only does boxing get you in the best shape possible, Marty's staff teaches you the actual sport of boxing.  He challenges me every time I come into the gym and I always walk out feeling like I got better.

Jamar Taylor - NFL Cornerback

Javon Hargrave.jpg

Marty and staff at 12th Round Fit assisted and contributed to my overall goals to condition, tone, and strengthen my body in the off-season.  They exceeded my expectations and I couldn't be happier with my results and experience.

Javon Hargrave - NFL Defensive Tackle

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