Find out more about our coaches here.

Nathan Zigler, Owner

I was born in Columbus Ohio and moved to Arizona when I was five. I’ve been involved with athletics my entire life, playing Pop Warner football, Little League baseball, basketball, track, BMX racing, mountain biking, scuba diving, shooting trap, weightlifting and martial arts. I am the owner and head instructor of Gracie Arizona Brazilian Jiu Jitsu Academy located here in Phoenix since 1999. I’m married to my high school sweetheart Lanie Zigler since 1991 and have twin daughters, Zoe and Parker.

In my free time I enjoy anything that can be done outdoors. I’m an avid fisherman, and during the summer you can find me at the lake fishing from my jet ski just about every weekend. I love camping on the Mogollon Rim with my family as well as making several trips to Rocky Point for more fun in the sun. I also love to ski and snowboard, so you can say I enjoy pretty much anything you can do outdoors.

I was introduced to CrossFit around 2010 by a student of mine. I ran track and I’ve always enjoyed lifting weights as well so when he told me what was involved, I had to give it a try; I was hooked from the first class. I was certified Level 1 in 2012 and opened Copperhead CrossFit February 2nd, 2013.

  • CrossFit Level 2 Trainer

Mitch Medeiros, Coach

I am California born and raised but I’ve gown to love Phoenix since moving here in 2008. My “day job” is in the accounting field but my passion lies in CrossFit. My Wife and I live in Central Phoenix with our two daughters and two dogs, Mikey the English bulldog and Murph the Pit/Boxer mix.

In my spare time, there’s a good chance that you’ll find me at the gym. I’m a gym rat and I love soaking up the atmosphere. Aside from lounging at the gym, there are a number of activities that always keep me busy. For starters, I enjoy Piña Coladas and getting caught in the rain. Joking aside, in my spare time I’m probably capturing or editing photos, watching a movie, reading or just hanging out with my family.

I first stumbled into CrossFit in 2006, while in college, during my days as a personal trainer. I slowly began working CrossFit methodologies into programs for myself and my clients. After witnessing the positive impact that it made, I quickly became a believer. While I do enjoy competing, coaching is what motivates me day in and day out. I love seeing our members hit a new personal record or nail a tough movement. I consider myself a much better coach than athlete and I am constantly striving to learn more. CrossFit gives me the chance to challenge myself as a coach and athlete and am grateful to be a part of this awesome community.

  • CrossFit Level 2 Trainer
  • Catalyst Athletics Level 1 Weightlifting Coach

Craig Rintoul, Coach

I am from sunny Southern California from a city by the name of Palmdale. I was born to Craig Rintoul Sr and Angela Rintoul, just before Labor Day weekend. I have two sisters, one older and one younger. Throughout my whole life I have always enjoyed being involved in sports. As a kid I had bad asthma and it kept me from doing a lot of activities. Despite that, I would play as hard as I could until I was in a full blown asthma attack. Once I got into high school I went out for Wrestling and Swimming to start my actual athletic career. I wrestled and swam all four years at the varsity level. After High school I still had the competitive itch so I started just working out until I found Judo, where I competed for three years until I moved to Arizona to go to school. Once in Arizona I found the sport of Olympic Weightlifting and I have been competing for the last five and half years. I have worked in the chiropractic and sports medicine field for the last nine years as an exercise therapist and chiropractic assistant. Currently I am a full time coach teaching people how to lift to their fullest potential.

In my free time I enjoy being social, listening to music, and drawing. Due to a school, work and athletic schedule most of my free time is spend doing homework or recovering from a workout.

Of all the sports that I have done Weightlifting is the most challenging. The weights always weigh the same and gravity is constantly fighting me. Everything is accounted for: how much you slept, how much you ate, and even what extracurricular activities have to take a back seat sometimes. All of that being said, it is also the most rewarding sport I’ve ever participated in. When you have worked so hard to reach your goal and you finally reached it, that is what this is all about and you forget all the sacrifices. It is kind of like life. Approach everyday like competition day and the competitions will be just like you practiced.

  • CrossFit Level 1 Trainer
  • Bachelor of Science Degree, Exercise Science
  • Chiropractic Assistant
  • USA Weightlifting Club Coach
  • Team Arizona Weightlifting Assistant Coach

Dave Tonn, Coach


I’m the local Phoenix boy living downtown and am the proud parent of two amazing kids, Crash and Roman. I spend my days coaching and developing a team of sales consultants in the industry of International Logistics

Growing up sport was certainly not my thing. I was always smaller, shorter, and skinnier than the athletic people; naturally I gravitated towards music performance. However, in my late 20’s I fell in love with running. I have completed 3 Marathons with a PR of 3:20:42, 3 Ultra-Ragnar Relays, and a couple dozen half marathons with a PR of 1:35:20.

During my time running, I’d heard of CrossFit and seen the games on ESPN. It looked difficult and something I had never seen before at the local gym. I just searched the web to find a CrossFit box in my area and started going. It was hard. In fact, my first day I couldn’t even lift the barbell above my head and at 29 years old, had never done a pull-up in my life. However, I had an absolute blast doing the workouts and just kept going back. Nothing with a barbell came naturally to me, and my first several workouts were with just a PVC Pipe. However, I really enjoyed trying and failing forward and I fell in love with the CrossFit community.

I am excited for our members to reach their individual fitness and nutrition goals. I look forward to working hard together in the gym so that we may greater enjoy our time outside of it.

  • CrossFit Level 2 Trainer
  • 3 Time Marathoner
  • 3 Time Ultra Ragnar (Team finished first place overall Ragnar Del Sol 2013)
  • Phoenix Throwdown Competitor
  • Sicfit Team Competitor
  • CrossFit Games Athlete Profile

Samm Maglio, Coach


I was born in raised in Grafton, Wisconsin and graduated from the University of Wisconsin Green Bay in 2018 with a Psychology major. I moved to Arizona beginning of 2019 to pursue my master’s degree at Grand Canyon University in Sport Business.

I have always been involved in sports but my main sports throughout high school were volleyball and softball. I am currently a student full time with a couple part time jobs but for a career, I strive to someday be a sports manager or in someway work with a professional team. Obviously, living in Arizona, hiking is a hobby of mine. I love to be outdoors either relaxing or going on adventures. I grew up being around nature all four seasons (yes, I survived Wisconsin winters).

I watched Murph in May of 2017 and was impressed by all of the athletes competing and I felt like I wanted to be apart of it. I found a local box not too far away from my college and I started CrossFit in September of 2017. The community is the number one thing I love about CrossFit. It does not matter how in shape or not in shape you are; the effort everyone puts in and the encouragement. I love the competitive edge not just with other people but myself especially. Improving times and weights give me a sense of accomplishment and success. After doing CrossFit for about a year and a half, I thought I would share my knowledge of what I know and pass it on to others to help them become better athletes. I am new to the coaching experience, but I hope to gain a lot of knowledge and expand my opportunities with coaching CrossFit.

  • CrossFit Level 1 Trainer