Our Story & Mission
"We workout hard at Green Door so you can play 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 calendar of events posted at the gym and would love to get your ideas on the calendar too!
To us physical fitness is the ability to carry out 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!
Meet 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 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!
Devin
Trainer
Devin is a dedicated fitness professional with a passion for helping clients achieve their health and wellness goals. With extensive experience in personal training and group fitness, Devin brings energy and expertise to every session.
Devin specializes in functional training, strength conditioning, and motivating clients to push beyond their limits. Whether you're a beginner looking to start your fitness journey or an experienced athlete seeking to elevate your performance, Devin creates customized programs tailored to your individual needs and 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.
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.
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.