2404 East Colfax Ave. Denver CO

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
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 all of Colorado’s 58 fourteeners. Always seeking a new challenge, he is currently training to climb the California 14ers and other states highest points.

Matt loves to share his love of the outdoors with his wife and daughter. He’s currently trying to keep up with his wife on the mountain bike and his daughter in gymnastics. "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!

Read their interview

Where are you from?: Lakewood Colorado
What are your fitness certifications?: Ace Certified Personal Trainer/Group Trainer and Nutrition Specialist, Kettlebell Certified, Spartan Certified, TRX RIP and Suspension Trainer Certified
Where did you go to school?: Adams State College
What is your favorite sport?: Football
What is your favorite color?: GREEN
What is your favorite exercise?: Power Cleans
What is your hobby outside of exercise?: Family time
Where is your favorite place you’ve been?: Todos Santos with Maree and Luna. Listening to the waves crash and playing in a 5 ft pool with them
What is your specialty?: Working towards total fitness for any age. I find myself in creating the perfect plan for you to follow and succeed in your fitness goals
What is your spirit animal?: Wolf
What is your cheat food?: Chocolate! Anything chocolate will do. Especially baked goods with chocolate!
What is your favorite joke?: What did the 0 say to the 8?….. Nice belt.
What is your favorite funny memory?: After a wonderful trip to Italy with Maree and Luna I ask Luna, “What was your favorite part of the trip?" She answers back, “Our layover in Miami".
What is your most embarrassing moment?: Having to give my first speech in speech class and finding out after the class from my friends that I had my pants on backwards!
What is your proudest moment?: Opening Green Door Fitness with all of my friends and family around to be a part of it and share in it with me.
What is your dream vacation?: A safari in South Africa with Maree and Luna. We will then go to Seal Island to watch the Great White Sharks feed. WOW! That will be cool!
What is your fitness goal?: To always be ready for anything. I strive to be close to peak performance always. When an adventure, race or life happen -which they always do- I’m more than ready!
What is one thing no one knows about you?: I don’t like sparkling water at all! Gross!

- Trainer
Kyle was born and raised in Morrison, a town near Red Rocks, in the state of Colorado. Sports, space exploration, and music have always been three of his greatest interests. For the University of Colorado Boulder, Kyle played Division I football (Go Buffs!). He graduated with a degree in astronomy and a minor in sports exercise science in May 2022. In addition to assisting clients in achieving their own personal health objectives, Kyle coaches football and track & field for Dakota Ridge High School, enjoys snowboarding, and creates music in his spare time. Kyle is always up for a challenge or anything that takes him out of his comfort zone. “I believe that life begins when you get comfortable being uncomfortable.”
- Trainer
Aaron is a Colorado native that grew up in littleton. He grew up playing football and lacrosse and pursued football into college. As a football player Aaron weighed 280lbs and when he decided to stop playing he flipped his health around and dropped 80lbs. He received his degree in exercise physiology at fort lewis college and received his CPT through ISSA. Aaron looks to work with youth athletes helping them get to the next level and achieve their goals as well as the general population looking to live a healthier better life. Stop by and let him help you reach your goals.
- Trainer
Cat is a Colorado native, born and raised in the small city of Alamosa, in the San Luis Valley. She grew up in a very athletic family, playing basketball all 4 years of high school, but also dabbled in volleyball, softball, and track in the off-season. After high school, she continued to university and graduated with a degree in psychology and history and continued to run 10Ks and played City League basketball. Staying athletic and fit was just a lifestyle she and her husband subscribed to and passed that on to her 2 daughters, who are currently D1 collegiate athletes.

In 2009 after training for the Granite State Open natural bodybuilding competition, she made the decision to become certified and licensed in group exercise, indoor cycling, and dance formats to share her knowledge of physique, weight training, and cardio training with others. She is excited to share her training style with you in attaining your fitness goals.
Bio coming soon...