Come for Fitness Stay for Family


Come experience all the fun, the close community, and the high-intensity workouts.

Unlimited Classes & All Day Open Gym


*family discount available

In their words

Options to match your schedule + Budget

It’s your time. Let’s Go.

The perks

Only at IronDen

Free Kids Room

All Day Open Gym

Locker Rooms

Central Location

IronDen Team

Justin Williams

Owner, Coach, Personal Trainer

I was born and raised in Billings MT where I grew up competing in gymnastics, football, basketball, baseball and track & field. After high school sports, finding something to feed my competitiveness was hard, until I was introduced to CrossFit in 2009. I fell in love instantly with the competitiveness and community CrossFit offered.

I got my level 1 CrossFit cert in 2018 and have coached at multiple gyms in Billings helping members work towards their goals and break down barriers as well as running a gym with my wife in beautiful Costa Rica. Since taking over Iron Den in 2021 I have been fortunate to meet some of the most amazing people and look forward to growing our great community!

Donnie Smith


Donnie grew up in Las Vegas, NV. He has been involved in sports and fitness his whole life. He wrestled and played football. He moved on to play football at Rocky Mountain College. He continued pursuing health as a career. He attended Logan College of Chiropractic in St. Louis, MO and came back to Billings, MT to practice as a Doctor of Chiropractic. He began his CrossFit career in 2018 and decided to coach CrossFit in 2021.

Direlle Stauffer


Hannah Stauffer


Grew up on a farm in a small town of Montana. She Loves living in Billings being a wife and mom of 3 amazing kids. She’s been doing CrossFit for 4 years and has been both pregnant and postpartum in her CrossFit lifestyle and truly loves how it has helped. She loves fitness and how it helps all areas of your life. She is passionate about making your time in iron den the best hour of your day. She loves all things people and fun music.

Jessica Welch


With over 10 years of one on one personal training, coaching classes, teaching seminars, and organizing challenges, you’ll find that most of my nutrition knowledge comes from real life experience. After struggling with a slew of chronic GI issues, I was forced to dive deeper into nutrition. I started sharing my love for healthy food and soon was meal prepping for people in my kitchen, leaving dishes stacked to the ceiling!

I’ve had to learn to navigate what fitness and nutrition goals were attainable for me through pregnancy, childbirth, gall-bladder surgery, chronic back pain and injuries, spine surgery, ongoing GI issues, and moving into the latter half of the thirties.

I’d like to help you find what works, and what doesn’t, so you can look and feel your best. I would love for you to find freedom from restrictions and diets and feeling guilty about food choices to viewing food as fuel and a way to transform your body from the inside out. I strongly believe that the habits and disciplines we apply in the areas of our food and fitness carry over into every other area of our lives!

Sarah Diaz


Sarah is a fitness professional who’s specialized in working with new moms since 2022. While coaching CrossFit during my pregnancy, I realized that there wasn’t enough education on safe training for pregnant and postpartum women! This motivated me to gain the education needed to help the women at my gym! I love working with my athletes to find the best fitness and health options for their unique needs.

Coaching credentials: 

• CrossFit L-1 
• Pregnancy and Postpartum Athleticism Coach 


• BS in Recreation Therapy, Health and Human Performance 

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