
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!
“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!

Aaron – 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.

Cat – 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.

Tim – Trainer
Denver’s own born and raised, Tim has always been on the move—whether it was tearing up the football field, dominating on the wrestling mat, or even throwing punches in the boxing ring. He even gave MMA a shot for a while. After high school, he kept his momentum going, earning an Arts degree from CCD & CSU. But staying fit was never just a hobby—it was a way of life. Balancing his love for art with his dedication to fitness, Tim carved out a path that combines creativity with physical strength.
Now, as a passionate gym trainer, Tim uses his years of experience to help others unleash their potential. From crafting personalized workout plans to dropping motivational tips on social media, he’s all about keeping people energized and excited about their fitness journey. Whether you’re sweating it out in the gym or following his posts for a daily dose of inspiration, Tim’s goal is simple: to help you crush your goals, have fun, and make fitness a lifestyle, not a chore.

Devin – Trainer
Born and raised in Lafayette, Colorado, and now a long-time resident of Denver, Devin discovered his passion for health and fitness through a supportive CrossFit community. Over the years, He transformed that passion into a profession, becoming a Certified Personal Trainer and Certified Nutrition Coach through NASM. His focus is on empowering individuals to achieve their fitness goals by creating tailored programs that emphasize strength, endurance, and balance.
Outside of coaching, Devin is an avid distance runner who thrives on both road and trail challenges. Strength training is another cornerstone of his routine, as he believes in the importance of building resilience for lifelong wellness. His mission is to inspire others to prioritize their health, not just for today but for the purpose of able-bodiedness and longevity, ensuring a vibrant and active future.

Caroline – Trainer
Caroline is a NASM Certified Personal Trainer and Nutrition Coach. With a large background in team sports like volleyball, soccer, and basketball, an active lifestyle has always been a cornerstone in her life. Outside of her background in team sports, she is an avid rock climber, skier, cyclist, reader, and cook.
Caroline is dedicated to designing programs that challenge and empower you, helping you grow toward any goal—whether on the trails, in the snow, up mountain walls, or navigating everyday life. She believes fitness is a pathway to strength, mobility, balance, injury prevention, and longevity, as well as a source of community, empowerment, joy, and fun. Caroline is passionate about helping individuals become the best versions of themselves by fostering sustainable, individualized habits around movement and nutrition.

Bruce – Trainer
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