Fitness for hunters, first responders, military and mountain athletes. Train at home, at the gym, or on the go.

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- Home and Gym Fitness Programs
- Mental Toughness Courses
- Self Improvement Courses
- Prehab/Rehab
- Biomechanical Form Coaching
- Stretching & Mobility Flows
- Nutrition Guidance
- Challenge Workouts
- MTNTOUGH Community

Tough Terrain = No Problem

Fancy gear and shooting practice won’t matter if you haven’t trained for high elevation and tough terrain. With MTNTOUGH, your fitness level won’t be a limiting factor in your life.

All Skill Levels are Welcome

You might not start as an elite athlete, but MTNTOUGH programing will get you to elite status. With thoughtful programing we meet you where you are at to achieve your goals.

Prehab for Injury Prevention

MTNTOUGH incorporates prehab stretches that address old injuries and prevent new ones into daily workouts to keep you healthy, strong and ready to mountain on.

What is the Fitness Lab?


We continuously research and test backcountry performance in “The Lab”, the HQ located in Bozeman Montana. This is where is where worlds most committed backcountry hunters, special operators, and first responders are testing workouts to insure each program offers mission specific movements that promote mobility and endurance to make you strong enough and durable enough to be MTNTOUGH.


Annual Plan

Set it and forget it—no hassle one-time yearly billing.


Month-To-Month Plan

Our most flexible plan. Cancel anytime.


GovX Military, LEO and First Responder Discounts

Those Who Serve

Customer Testimonials



"Been using MTN tough for the past year and just following the backcountry program and their diet plan I put on an additional 15-20lbs of muscles. It also enabled me to be able to hunt for about 80 straight days with morning hunts before work and lifting after work and backpack trips over the weekends."

Duke Lamm

Boise, ID


"MTNTOUGH is the real deal. It is so much more than a workout program. It sharpens you mentally and spiritually, and I felt that more than ever this season. These programs make the workouts from my college soccer days look like a walk in the park. My fitness and strength have never been better than they are right now. "

Jack McCunn

Denver, CO


"With MTNTOUGH, fitness is never my worry when looking up at the extreme terrain now. From 15-20mi days with 3k-5k feet of vert, multiple log jams, rock slides, and cliffs my legs and mind are conditioned for the task at hand."

Brice Suhay

San Diego, CA


"I wanted to find a job where I could do something physical, be outside, and be in the mountains. Wildland firefighting allowed me to do all those things....I’ve been training for wildland firefighting for two decades, and I’m very impressed with MTNTOUGH. With MTNTOUGH my strength and cardiovascular fitness is as good as it’s ever been right now.”

James Pummel

In The Mountains


"I’ve had a lot of exposure to different types of workouts in my past, and the programming at MTNTOUGH is the most effective program I have ever done. The team at MTNTOUGH pushes people beyond what they think they are capable of."

Sam Holt

Bozeman, MT


"Being in a sniper section we do a lot of movements with heavy rucks and MTNTOUGH has proven to be an amazing program to have in the field. Highly recommend it to anyone looking to get better for the hunting season with limited equipment or anyone in the military preparing for Ranger school."

Ian Slusher

Flagstaff, AZ


"I have tried numerous apps and workout programs but nothing comes close to what MTNTOUGH has to offer. I have started with the 30-30 No Gear workouts and have seen a vast increase in my physical performance. I think it also has a lot to do with their attention to detail!"

Johnny Utah

Los Angeles, CA


Stop Searching For A Better Program! I remember I was talking to my buddy Chris who was going into selection for SF. I asked him what program he was using to get ready. After I named a few he said the best one I’ve used is MTNTOUGH. And that’s when it clicked that this was the real deal. I love the community, the app, the workouts, everything.

Kelly Fassioto

Breckenridge, CO


Research and Development is at their core, and they spent over two years testing their MTNTOUGH Backcountry Hunter Preseason Prep program on some of the world’s most dedicated mountain hunters.

Stone Glacier

MTNTOUGH Fitness Lab believes eliminating psychological barriers is the key to reaching your goals. Their team, which includes former US Navy SEALs and Army Rangers knows the most important muscle you can train sits between your ears.


Forge the muscle endurance and strength needed to become a human pack mule.

Men's Journal

You can make sure your body and mind are ready to take on the toughest tasks the backcountry will throw at you.

Backcountry Hunter Magazine

There is hands down one training program that really trumps them all: MTNTOUGH

Go Hunt

At MTNTOUGH, physical fitness also includes an additional component — mental toughness.


MTNTOUGH Fitness Lab has established itself as the elite source for improving mental toughness, physical preparation, and performance research for the backcountry hunter.

Journal of Mountain Hunting

Programs in MTNTOUGH+

NEW PROGRAM: With Coach Donny Bigham


FORM LAB is MTNTOUGH’s new biomechanical baseline assessment program. Join powerlifting world champion and Tactical Strength Coach Major Donny Bigham as he coaches athletes through 12 core exercises to improve form, increase performance and prevent injuries for the long haul. Start improving your form and performance today!

Learn More

Meet Your MTNTOUGH Coaches


Founder / Head Trainer

Dustin Diefenderfer helps individuals reach their specific personal and professional goals by pushing them to become more mentally tough. An ultramarathoner and backcountry hunter, Dustin focuses on mountain and hunting conditioning to achieve success in all aspects of life. A National Academy of Sports Medicine Certified Personal Trainer, Dustin’s overall philosophy is based on work ethic, grit and helping his clients learn to be comfortable being uncomfortable.


Athletic Director

A Division-1-soccer-player-turned-personal-trainer, Sarah knows a thing or two about what it takes to get stronger and become a better athlete. It’s all part of the training process – and one she is passionate about. When the Tennessee native isn’t crushing life in the mountains, she’s busy fostering mental toughness for all levels (from beginner to elite) by creating workouts intended to push you to your limits – physically and mentally – and make you stronger inside and out.


Director of Mindset

Phil brings this unique, experience to improve mental toughness to the MTNTOUGH Community. Building top performing leaders and teams has been a critical part of Phil Kornachuk’s life for the last three decades. Corporate leadership, collegiate sports teams, elite military units, non-profit leaders, emergency services and other organizations have all been impacted by Phil's unique approach to forging elite leaders and teams. He leverages over 22 years of experience serving, leading and developing elite teams within the US Army Special Operations Community. He earned a Bachelor of Science and a Masters in Organizational Leadership from Gonzaga University.


Dr. of Physical Therapy

Tom is a board-certified orthopedic physical therapist and strength and conditioning specialist certified by the American Board of Physical Therapy Specialties and a Certified Strength and Conditioning Specialist (CSCS) by the National Strength and Conditioning Association. In addition to his clinical practice, he runs one of the world’s largest social media accounts dedicated to physical rehab (@rehabscience). From 2012 to 2019, he served as a full-time kinesiology professor at Westmont College and taught courses including: biomechanics, therapeutic exercise and pain science. Tom has a bachelor of science (B.S.) in exercise science at Montana State University and then earned a Doctor of Physical Therapy (D.P.T.) degree at Chapman University in Southern California. Afterwards, as well he completed a residency in orthopedic manual physical therapy (OMPT) and a fellowship in lower quarter functional biomechanics.


Director of Spiritual Growth

Brian Van Eps is a passionate, driven, leader of leaders. His primary focus is to help men grow
and develop in the deeper work of life to become the husbands, fathers, and leaders. Drawing from his 20 years of pastoral ministry experience (M.A. Denver Seminary) and now owning and operating his company, Legacy Guides, Brian helps, “craft the
story that others will tell.” His approach is a unique blend of exploring the wild places on the
river and the mountain, while being drawn into the depths of the untamed places within our
souls. Van Eps purpose it to, “live fully and adventurously by passionately following Jesus,
lovingly leading his family, and boldly guiding leaders. “

Major Donny Bigham

Tactical Strength Coach

Retired Major Donny Bigham has over 27 years of service in the Marine Corps and the U.S. Army with 48 months of combat deployments to Bosnia, Afghanistan, Kuwait and Yemen. Major Bigham is known as the first ever strength and conditioning coach for the U.S. Army (Conventional Forces) and was instrumental in being part of the team that changed the U.S. Army Physical Fitness test after almost 40 years. He co-authored the Occupational Performance Assessment Test for initial screening of future soldiers and designed the Tactical Athlete Performance Center (TAP-C) at Fort Jackson and Fort Benning, emphasizing true strength, mobility, and speed to increase lethality and survivability. He currently holds multiple world records in powerlifting and was named the International Powerlifting Federation World Powerlifting Champion in 2015, 2016 and 2019 (bronze). 


Mobility Coach

Heather trains individuals and groups across multiple modalities, concentrating her fitness practice around a holistic approach to physical training, nutrition, mindset and spirituality. With over 25 years of coaching and training experience, she has led fitness and yoga retreats around the world while continually taking classes to evolve her training and improve her understanding of the body and mind.  “I strive to coach with passion and compassion using knowledge and experience,” says Heather. “I teach people to be patient with their practice.”

Alex Fichtler

Tactical Advisor

Alex Fichtler was born and raised in the Big Sky state of Montana. He’s a former Navy SEAL that spent time not only in Afghanistan and Africa but has applied his fitness in some of the toughest conditions on the planet. He believes in setting the bar high and living the standard of being forged by the fires of trials so that we can overcome them verses being overcome by them. “I train in the gym and on the mats, I learn, I hunt, I shoot, and I perform so I can be the best man I can be. Empowering others to find the mental toughness inherent in all of us, to help them dig down and find their grit, and to ultimately become stronger, faster, and healthier is my target.”


Athletic Advisor

Bozeman native Jimmy Alsobrook Jr. grew up on the great rugged terrain that Montana is known for while becoming an avid hunter and angler. No stranger to backcountry ventures, Jimmy has climbed treacherous mountains in search of bighorn sheep and fished the expansive waters of Fort Peck Reservoir and he’s always after another adventure to add to his collection. Certified by the National Academy of Sports Medicine, Jimmy has been a personal trainer for the past 12 years. He specializes in functional training and sports conditioning and has devoted his career to helping his clients achieve their personal goals in fitness like climbing Mount Everest. 



Access guided training and on-demand workouts from your phone, tablet, TV or computer.


Everything you need in one spot - including nutrition and mental toughness training. 


No equipment needed to start. Beginner to elite level workouts.


World-class industry leaders will keep you encouraged and motivated. 


Access all MTNTOUGH+ content and future content. New content uploaded frequently.


From cardio to strength MTNTOUGH+ programs are designed to build the optimal athlete. 


Take ownership of your life with mental toughness, survival, spiritual and nutritional training bonus content. MTNTOUGH+ is far more than just a fitness app it is a lifestyle.


Fly the Flag


Tested and performance approved, MTNTOUGH gear is designed for the gym, at home, around town, or on the mountain.



Today and every day, MTNTOUGH proudly offers a significant discount to Military Members, Veterans, LEO’s, First Responders, and Professional Guides. 

MTNTOUGH+ is used extensively throughout the US Military, WIldland Fire and First Responder communities and team/unit discounts are also available for entire departments. 

Click here to save up to 40% on MTNTOUGH+ and checkout with your GovX ID.

With MTNTOUGH+ you can access our entire library of MTNTOUGH programs, workouts, bonus content and all future content.  Access to thousands of hours of training on your phone, tablet, TV and web browser.

Many of the MTNTOUGH+ workouts don’t require any equipment other than a pull-up bar. All you need is space to move and a place to do pull-ups.  We recommend pull-ups in all our bodyweight and minimal programs as they are an incredible way to add total body strength however many modifications can be used such as TRX straps and bodyweight rows if you don’t have a bar and/or are traveling. 

KB20 requires a kettlebell and 45-70 requires a pack and sandbag kit. 

Our gym programs: MTNTOUGH Preseason Prep, In-Season, Postseason Strength, Spring Training Camp and Elite Spring require gym access or a robust home gym. 

With MTNTOUGH+ you can access our entire library of MTNTOUGH programs, workouts, bonus content and all future content.  Access to thousands of hours of training on your phone, tablet, TV and web browser.

Yes, you can use MTNTOUGH+ when you travel. There’s a simple 3 step process to make sure you can access your favorite workouts, anywhere.

STEP ONE: Make sure you’re all signed up for MTNTOUGH+.

STEP TWO: Download the MTNTOUGH+ app for your device before you leave home.

STEP THREE: Connect to a good WiFi signal, choose your program, and go for it.

You can also download workouts to your Android or iOS device to work out without an internet connection. Work out anywhere, anytime with offline viewing.

If you want to use MTNTOUGH+ when traveling, please use one of our apps.

MTNTOUGH+ offers a free trial* to new customers to try out our entire selection of programs and workouts. If you're not satisfied, you can cancel your account before your trial ends and you will not be charged.

*Cancel anytime during free trial.

One of the best features of MTNTOUGH+ is that it's suitable for your level, whether you are a beginner, intermediate or elite athlete. MTNTOUGH coaches often provide modifications - and you can workout at your own pace to ensure you're working hard no matter your fitness level. The workouts aren’t easy but will prepare you for both the unthinkable and the everyday.

MTNTOUGH+ lets you do your workouts on most popular devices. In addition to the website, MTNTOUGH+ workouts are available through our free apps on:

Smartphone: iPhone, Android phone

Tablet: iPad, Android tablet, Kindle Fire tablets

TV streaming: Amazon Fire TV, Roku, Apple TV4, and Android TV

Gaming console: Xbox One

You can also cast your workouts to Apple TV from your Apple devices and Chromecast from your computer and Android devices. Simply search 'MTNTOUGH+' in each device's app store to find our app.