Personalized Coaching
Train one-on-one or in small groups with focused attention. You’re coached as an individual, not lost in a crowded class or handed a cookie-cutter program.
The Mill Fitness
Personal Training in Denver Highlands
Get Stronger.
Move Better.
Stay Consistent
Strength Training Built for Real Life
The Mill Fitness is a personal training service based in the Denver Highlands. Inspired by the idea of a mill — where material is shaped and strengthened over time — training here is built on steady, intentional progress that supports a more capable and enjoyable life.
Programs are individualized around your goals, experience, and lifestyle. Whether you’re preparing for ski season, improving body composition, training for an endurance event, or simply wanting to feel stronger day to day, the emphasis is on foundational strength, quality movement, and conditioning that supports long-term health.
The space is private, welcoming, and ego-free — designed to help you train with focus and leave each session stronger and more confident than when you arrived.
Request More InfoWhy Choose The Mill?
Structured, Thoughtful Programming
No random workouts. Programming is built around proven training principles to help you get stronger, move better, and stay healthy—without unnecessary wear and tear.
All Experience Levels Welcome
New to strength training? Coming back from an injury? Training for a specific goal or event? Coaching is adapted to where you’re at, not where you "should" be.
Consistency and Accountability
Training is more than just workouts. You’ll get guidance around consistency, recovery, and sustainable habits so progress actually sticks.
Training Options
Private Training
One-on-one training fully tailored to your goals and schedule
Partner Training
Train with a friend or partner while still receiving focused, personalized guidance
Online Programming
Personalized training delivered remotely. Receive structured programming tailored to your goals, along with ongoing guidance and accountability to keep you progressing.
Meet Your Coach
Jonathan Miller, owner of The Mill Fitness, began his professional journey in fitness in 2020. He spent his first few years leading group classes before moving into the world of personal training in 2024. As a former hockey player, he spent years in the gym training to be better on the ice—but over time, he realized that the gym is about so much more than just performance. It’s a foundation for a happier, healthier life, and that’s a shift in perspective he loves sharing with his clients.
With a background in Hospitality Management, Jonathan’s coaching style is all about the person, not just the program. He truly enjoys the “people” side of his work, focusing on building real connections and making sure that while you’re hitting your goals, you’re actually having a good time doing it.
Now, with The Mill Fitness, Jonathan has created exactly what he felt was missing: a welcoming, comfortable environment to get the results you’re looking for.
Getting Started is Easy
Talk to a Coach
Fill out the short form below. I’ll reach out to talk through goals, ask questions, and see if we’re a good fit to work together.
Try It Out
Come in for a commitment-free trial session. Meet your coach, see the space, and experience what training at The Mill is like.
Start Seeing Results
Show up consistently to start building strength, improving movement, and increasing overall fitness.
Location & Contact
Location
3555 N Pecos StDenver, CO 80211
Contact
jonathan@themillfitness.comTalk to a Coach
Interested in training at The Mill? Fill out the form below and we’ll be in touch to answer your questions and help you get started.