About Us

Pillars of Fitness

Cardiovascular Endurance

The ability of the heart and lungs to adjust to and recover from the effects of whole body exercise.

Body Composition

The amount of fat mass compared to amounts of lean muscle mass, bone and organs.


The capacity of each joint to move through a full range of motion.

Muscular Strength

The amount of force a muscle can produce for a maximal 1 rep.

Muscular Endurance

The ability of the muscles to perform continuous submaximal force with out fatiguing, or a sustained contraction for a period of time.

Why Green Door Fitness?

Because we strive to be energy independent and to get outdoors.

We are working on becoming a certified Green Business through the city of Denver, we recycle, reuse, and try to reduce our waste by using cloth towels and our own water bottles. We don’t have paper cups or paper towels.

Our motto is We workout hard at Green Door so you can play outdoors! We will have a calender of events posted at the gym and would love to get your ideas on the calender too!

To us physical fitness is the ability to carryout daily tasks with vigor and alertness, without undue fatigue and with ample energy to enjoy leisure time pursuits and to meet unforeseen emergencies. Put easier we want our workouts at Green Door Fitness to be challenging and harder than anything you have in your daily life. So when life happens you are ready! That creates a sense of ease and enjoyment when you are playing with your family, walking the dog, or when tragedy strikes and you need to run for help. We want you to be prepared for anything, which means being Green Door Fit!


Our Expertise

Over-Delivering Personal Service (100%)

Weight Loss (90%)

Cleanliness (99%)

Building Great Relationships (99.9%)

Fun Friendly Environment (98%)

"Matt is one of the finest human beings kindest souls and motivating and creative individuals I have ever met. He has made it his life's journey to study the human body and is an expert on nutrition fitness as well as mind and body spirit. He has a very unique approach and is always a positive and motivating influence on his clients."

~ A. Wilson

Our Team

Matthew Hammel

Owner / Trainer
Matt is a native Coloradan who grew up in Denver. His first passion was football but a hamstring injury forced him to pursue other avenues for his love of physical challenges. In 2001 he graduated from Adams State College in Alamosa with a degree in Exercise Physiology. In 2001 he obtained his personal training certificate from ACE and is also a certified massage therapist.

Besides helping his clients meet their own physical and health goals, Matt loves running, mountain biking, and hiking. He’s climbed 46 of Colorado’s 56 fourteeners with his dog, Sasha. Always seeking a new challenge, he is currently training to rock climb the wall in Yosemite National Park.

Matt loves to share his love of the outdoors with his wife and daughter. He’s currently teaching his six-year old daughter, Luna, to ski. "One thing I’ve learned," he said, “is if you don’t take care of yourself, you can’t take care of others.” Being healthy is wealthy!

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Lynn Bouck

Lynn has been passionate about sports and fitness her entire life, swimming through high school, rowing in college and now competing in triathlons, playing tennis, backpacking and mountain biking whenever possible. After a career teaching elementary school and raising three children, Lynn decided to combine her passions of fitness, teaching and helping others and recently graduated from the National Personal Training Institute earning her Personal Training Certification through the National Academy of Sports Medicine. Lynn holds the belief that with the proper guidance and encouragement, and by taking it one step at a time, one choice at a time and one day at a time, we all have it in us to reach the health and fitness goals we set for ourselves.
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Sarah Maestas

Sarah recently completed her second fitness certification through The National Academy of Sports Medicine. She truly loves to work with all different types of people from children to seniors to first time gym users. She enjoys running bootcamp classes and pushing you to the next level. Sarah has been in love with fitness ever since she was a little girl. She has played a variety of different sports throughout the years, but she has always adored distance running, with multiple events under her belt she is always preparing for what's next. Sarah believes it's never to late to reach your fitness goals!
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Warren Boizot

Real Estate Appraiser-Health and Fitness FANATIC-Pop culture aficionado-5280 Mag's Top of the Town Tweeter '12 and '13 Row and Spin Instructor, an innovative workout Creator at GDF!
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Maree Chavez

Hair match maker, Salon Owner, hooked on J. Fallon, Biggest Heart ever! Spin Instructor, Salad Organizer and Inspirational Leader at GDF!
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Denise Abdoo

Denise Abdoo recently completed her Sports Performance Coach Certification through USA Weightlifting. She has been working out with Matt Hammel for years (last count was around 12) and has developed an appreciation for cardiovascular workouts, but really thrives on weightlifting. She believes that through proper technique and programming one can improve their strength performance as well as reap the benefits of bone health and body composition changes through weight training. As an added bonus through performance and consistency in the gym, it is easier to go outside and play in our beautiful state.
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Glenn Main

Glenn is passionate about fitness and helping others reach their goals. He played a variety of sports growing up and always loves to compete. He recently served in the United States Navy as a Corpsman (medic) and learned a lot about injury prevention and military style work outs.

He is currently attends CU Denver and is working towards his bachelor’s degree in Business Management. In his free time, he likes to participate in obstacle course races and go on hikes in the mountains with his wife Lily and their dog Jack. Glenn believes anyone can accomplish anything they set their mind to, no matter how difficult the journey might be to get there.
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Michael Mora

Michael is a twenty-two year old male who has a passion for fitness and nutrition. He is in the process of getting his Bachelor degree in Nutrition at Metro State University. Michael is a Colorado native that loves to hike, snowboard and explore the beautiful Colorado mountains. He played football throughout his high school career and is currently in the process of getting prepared for his first ever Men’s Physique competition next June! On his free time Michael likes to ride his bike around Denver exploring the big City, while also exploring the mountains on his mountain bike.
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Julie Schuldt

Julie is a licensed Zumba fitness instructor who is always ready to rock out to the next bass drop! She has been teaching since 2013, leading weekly workouts on her college campus in Pennsylvania, and classes for the working professional since moving to Colorado. Julie also teaches Zumba's newest HIIT format - STRONG by Zumba.

Julie is an avid percussionist. Her love for music began when she lived in Japan and played the Japanese taiko drums at age 5. In high school and college, she was a part of the Drumline. Julie has traveled extensively in Asia, Europe, Central, and South America. She has added Korean and Brazilian drums to her repertoire, and has led Zumba classes in five countries outside of the USA.

Julie currently works in the non-profit sector promoting education. She enjoys playing Ultimate Frisbee, and tries to keep up with the 3 foreign languages she has studied and the many friends she has around the world.

Join Julie for a class full of energy, moves, and bass drops that will unlock your fitness potential.

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