Northglenn Staff 2018-02-02T12:17:34+00:00


Jon Cerf
Jon CerfFounder
Jon Cerf is the founder of Core Progression and has been a personal trainer for 10 years. He has a B.S. Degree from Baylor University in Exercise Science. Jon believes in a scientific approach to helping people reach their fitness goals, whatever they may be.

He has worked with hundreds of clients over the years in all different age ranges and of all fitness levels, from elite athletes to kids to beauty pageant contestants, to people just wanting to look and feel better. Jon follows a four-component program to help everyone achieve their goals.

The four components of Jon’s program are nutrition counseling, cardiovascular endurance, resistance training, and last but not least, accountability and the motivation of having a trainer. Never Plateau is the motto of Jon Cerf and the Core Progression Elite Personal Training team. Whatever your goals may be, let us help you reach them!

Erica Clarkson
Erica ClarksonPersonal Trainer
Erica was born and raised in Minnesota. She received a B.S. in Biochemistry from the University of Kansas. Much of what she teaches today stems from her knowledge of the body on a cellular level.
Erica has devoted her career to developing the newest and most effective fitness programs. Her most popular being the Commit Bridal Fitness Program. She believes there is nothing more rewarding than sending her brides down the aisle looking and feeling their best on the happiest day of their life.

Erica lives in Lohi with her husky-mix, Cooper. One thing you didn’t know about Erica – I eat chocolate every single morning… specifically, brownies. Erica grew up in Minnesota but recently found her new home here in Denver. She loves this city.

Literally everything inspires Erica about this field. She loves how clear the mind becomes once all the days’ stress is thrown away. There is nothing quite like the look on her clients face when they do something they thought they couldn’t. She’s inspired knowing that there is always something more she can learn about the body. But most of all, she loves how raw and real it is. No matter where you are in your life or where you want to be, fitness will always be there.

Kaleigh Eagan
Kaleigh EaganPersonal Trainer
Kaleigh Carignan was born and raised in Norwich, Connecticut. She grew up playing soccer, basketball, softball, and lacrosse competitively and fell in love with snowboarding at a young age.
She attended Clemson University in South Carolina and has since lived in Boston, Massachusetts, and Santa Maria, California before coming to Colorado. Prior to arriving in Colorado she was certified through National Academy of Sports Medicine as a Personal Trainer and discovered her passion. She is a certified Women’s Fitness Specialist and Fitness Nutrition Specialist also through NASM.

Kaleigh uses a combination of resistance training, HIIT training, and proper nutrition to help clients reach their goals. Your contact with Kaleigh won’t be limited to your training sessions. She has constant contact with her clients outside their training hours and makes sure that she is available to answer any questions, no matter how small. She believes that everyone should be able to achieve their fitness goals and feel comfortable in their own skin. She would love to share her knowledge and guide you through your fitness journey, no matter what your goals may be. Reach out to Core Progression and get started training with Kaleigh today!

Kaleigh has lived all over the country, as her husband is in the Air Force – she easily adapts to new places and Colorado, specifically Denver, is one of her favorites. Kaleigh loves spending time with her husband and their Lab, Lulu. She thoroughly enjoys cooking and uses Pinterest as a resource regularly for inspiration and new ideas. Kaleigh loves that the fitness industry is always growing and changing, much like the body. She is constantly pushing herself and her clients to new limits.

Kelly Schreuder
Kelly SchreuderPersonal Trainer
Kelly grew up in the suburbs of Chicago where she fell in love with sports, specializing in swimming, lacrosse, and water polo. Kelly graduated from Purdue University with a B.S. in Dietetics and a B.S. in Nutrition, Fitness, and Health.

Kelly developed her passion for fitness by becoming a group exercise instructor at Purdue, where she taught cycle, yoga, Insanity, body sculpt, and Tabata. As an ACSM personal trainer, specializing in strength and conditioning, she loves helping people reach a new level of fitness. And she is excited to share my passion and knowledge in nutrition and fitness to help you achieve your goals!

When she is not in the gym she loves backcountry skiing, traveling to new mountains, and hiking with her rescue dog. Kelly graduated from Purdue University with a B.S. in Dietetics and a B.S. in Nutrition, Fitness, and Health. After graduating she moved out to Colorado for a strength and conditioning internship working with all different types of clientele ranging from high school athletes to weight loss and rehabilitation clients.

Jarrett Crockett
Jarrett CrockettPersonal Trainer
Jarrett Crockett, born and raised in Colorado, received his Bachelors of Science in Health and Exercise Science from Colorado State University. While at CSU, Jarrett developed a passion for helping push athletes of all ages to reach their goals.

After graduation, Jarrett became a Certified Strength and Conditioning Specialist through the National Strength and Conditioning Association.

Jarrett’s background in athletics and sports performance training allow him to bring a unique perspective to his training at Core Progression. Jarrett likes to remind his clients that everyone has a different journey to reach their goals, “don’t compare your chapter 1 to someone else’s chapter 20”.

When he is not working in the gym, he is either coaching youth and high school baseball or up in the mountains snowboarding, golfing, or fishing.

  • I believe in the power of positive think and recite affirmations every morning.
  • Between coaching and training, I have accumulated 10 years of helping others reach the goals and dreams.
  • When it comes to relaxing I prefer staying at home with my wife and dog watching a documentary.
Kyle O'Donnell
Kyle O'DonnellPersonal Trainer
Kyle has been training for over 7 years now and weight loss and overall health are his focus and speciality. He grew up in South Florida near the beach where he actively played competitive sports such as baseball, basketball, beach volleyball and soccer.
Kyle’s favorite part about training is watching his clients build confidence in themselves while reaching their fitness goals, and seeing the results carry over into their everyday life. The most enjoyable form of working out for him is hiking and anything outdoors. Staying active and working out is important to Kyle for an overall better wellbeing, but mostly so he can eat all the pizza he wants.
Will Goodwin
Will GoodwinPersonal Trainer
Will grew up in rural Virginia. He spent countless summers hiking the Appalachian Mountains near his home and played baseball and lacrosse. He attended Virginia Commonwealth University before ultimately moving to Colorado.
He believes that as humans, we are made to move a lot, in as many ways as possible – to walk, to crawl, to lift our children, hang from trees, squat down, and hike mountains. Yet, we live in a time where being a human is getting harder. We have little time to move or take care of ourselves.

Will came into the world of health of fitness very ‘dehumanized’. He suffered from anxiety during college and realized he was losing his ability to move well. To change his outlook on life he began going for walks and eventually made his way to the gym where he started strength training. Next was yoga, gymnastic training, and anything else that allowed him to use his body in unique ways. He became captivated by movement and the human form.

After seeing how much of an impact health and fitness had on his life Will decided that he wanted to share that with others. After graduating from college, he went on to become a certified personal trainer and yoga instructor.

He loves helping others achieve their goals, whatever they may be. He is always learning, drawing from the knowledge of others, and using his own training experience to give clients the best experience possible.

A unique aspect of Will’s fitness is in not owning a couch. It sounds strange but his mobility went through the roof when he gave up the sofa and had to learn to get comfortable sitting in a squat and on the floor. You don’t have to go to his extreme, but it goes to show there is ample opportunity to work on your fitness if you’re willing to make a few sacrifices.

When Will isn’t in the gym he fills his time with anything that grabs his attention. He loves to learn new things; his interests vary but whatever hobby he pursues he dives in head first. You can find him in the woods on the weekends, experimenting with new spices in the kitchen, or playing bluegrass and folk music whenever he gets a chance. Recently he has taken up trying to roast his own coffee beans and has been mostly unsuccessful.

Laura Roberts
Laura RobertsPersonal Trainer
Fitness and wellness are Laura’s passion! As a certified fitness professional for 20 years, Laura have worked with individuals and groups in both corporate and recreational settings.
Laura is a Personal Trainer, Fitness Instructor, Yoga Teacher and a Fitness Presenter/Educator. Fitness is not One-Size-Fits-All, so she has numerous strategies to meet client needs, be it overall wellness, stress management, foundations for exercise, weight loss, nutrition, injury prevention, rehabilitation and corrective exercise. Laura’s role is to inspire, motivate, educate and coach my clients as their goals are realized.
Johnny Woodford
Johnny WoodfordPersonal Trainer
After being an All-State high school wrestler, Johnny went on to get his B.S. in Exercise Physiology and a minor in Sport & Exercise Psychology from West Virginia University.
After becoming certified through the NSCA with CSCS (Certified Strength & Conditioning Specialist), helping others avoid the pitfalls and plateaus that he encountered has become his passion.

Being injured and/or having to deal with pain is no fun and Johnny understands that. Playing sports most of his life and hitting the weights at a young age, Johnny learned many beneficial life lessons, but also learned that poor movement patterns could counteract all the progress being made. With proper planning, we can minimize injuries and attack goals relentlessly, safely, and effectively!

Being able to keep doing the things we love and pursuing new, challenging goals is crucial in life. It’s time to reclaim our bodies, see fitness in a new way, and have fun along the way!

Johnny hates being comfortable so trying new things is a compass of his. Whether that is snowboarding a mountain he never thought he could do, meeting new people and talking about unique ideas, or chasing any type of adrenaline release. Feeling nervous makes him feel human and conquering those nerves makes him feel alive. He loves longboarding, Olympic weightlifting, and meeting new, interesting people for these reasons.

Brittney D'Aloia
Brittney D'AloiaPersonal Trainer
Brittney D’Aloia was born and raised in Broomfield, Colorado. Growing up a competitive gymnast, she fell in love with sports and fitness at a young age.
Growing up a competitive gymnast, she fell in love with sports and fitness at a young age which inspired her to obtain her B.S. in Health and Exercise Science from Colorado State University.

After college she was certified through the American College of Sports Medicine as a Personal Trainer. She is passionate about helping people reach their health and fitness goals through proper nutrition, strength training, and HIIT!

Outside of personal training, Brittney enjoys engaging in outdoor activities including hiking, snowboarding, fishing, and camping. She spends majority of her free time with friends and family, and believes that a strong support system is a key factor to living a healthy life. She strives for overall good health and balance in life, and her biggest goal is to be genuinely happy!

Jeff Lewis
Jeff LewisPersonal Trainer
Jeff is a Colorado native and a graduate of Metro State University of Denver Colorado.
He received his B.S. in Human Performance and Sport – Exercise Science with a minor in Nutrition. Jeff is also a Certified Sports Nutritionist through the International Society of Sports Nutrition.

He has experience in training NFL and other professional athletes, youth and collegiate athletes, as well as collaborating with physical therapists to rehab those with sport or other physical related injuries. Jeff has also competed in and coached athletes for NPC bodybuilding competitions. He specializes in functional training, Olympic weightlifting, sports specific training, and correcting biomechanics. He also heavily focuses on coaching nutrition to excel those towards their goals.

His true passion lies in human performance and movement. Having grown up overweight and playing sports, Jeff believes it is important to achieve your “ideal you” using functional training. Long lasting success and a fit and healthy lifestyle is achieved by looking the part, while being able to perform the part. He believes there is no greater feeling than helping someone start their journey from the ground up without ever hitting a ceiling.

With his experience, Jeff believes working on the foundational movements, fixing nutritional habits, and getting a solid customized program in place is the key to success for anyone looking to improve their performance, strength, muscle gains, and/or weight loss.


Commit to your health and happiness with some of the best trainers in Colorado


Core Progression