Welcome to
Vitality Training Studio!
Hey there! At Vitality, we're not your average big box gym. Think of us as your personal, cozy studio right here in Littleton, where you'll genuinely feel at ease getting stronger – no matter where you're starting from.
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Our expert trainers really get to know you. We're all about personalized approaches, whether you're bouncing back from an injury, navigating the incredible journey of pregnancy or postpartum fitness, gearing up for your next triathlon, or just wanting to build some serious confidence in your own skin. In our intimate, non-intimidating space, we focus on proper form and sustainable progress. We love helping everyone, from dedicated athletes to everyday movers, achieve functional strength that not only boosts performance but also makes daily life feel a whole lot easier.
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"Vitality" means being strong and active, and that's exactly what our team is here to help you discover. We've created a safe place for you to get stronger, be more active, and feel truly confident through exercise and nutrition, with a personal trainer who's got your back every step of the way.
Our Specialities
Movement During & After Pregnancy
Expecting? Stay active and prepare your body for its amazing journey! We'll modify your workouts to keep you comfortable and strong throughout your pregnancy, getting you ready for when baby arrives.
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Just had a baby? We get it – that "bloated water buffalo" feeling is real (and totally normal!). Come in to safely regain your strength and confidence. Little ones are always welcome in our studio!
Fitness As You Age
We're here to help you maintain your vitality, strength, and independence for decades to come. Forget any "chair exercises"—we focus on building genuine muscle, balance, and mobility so you can confidently continue all the activities you love with minimal pain, actively preventing falls and improving daily life. It's about living fully and independently.
Pain Management
"Exercises I Need to Age Gracefully"
"...When I met with Stef, she put together a strength and nutrition plan specifically for my goal to feel good training for and during the [triple bypass] race. I still use that nutrition plan now because it helped lose some weight, but more importantly helped me to feel good. I have worked out on my own for 30+ years doing basic strength exercises, but the variety Stef provides has opened my mind up, showing me a different way to exercise that I don’t think I would have discovered on my own... So many exercises have improved my balance and flexibility, which I’ve discovered I need in order to age gracefully... Anyone who works out but doesn’t seem to be getting the results they are looking for, you should consider contacting Stef and the trainers at Vitality...Working out at Vitality has opened my eyes to movements that work best for me, that supports my love of cycling, hiking and life injury free."
Meet Stef Callens, Owner of Vitality
I started my career as a systems engineer, just like my dad, at Lockheed Martin. The paycheck was good, and I was good at the work, but after a decade of feeling unheard and unfulfilled in that corporate environment, I knew it wasn't my true calling. My mind kept returning to fitness—it had always been my mental escape and grounding force.
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So, I got certified as a personal trainer. But honestly, I always disliked the typical "big box" gym environment, especially as a woman, so I decided to do things differently. I started training clients independently, and then, in 2019, right around the time my oldest daughter was born, the perfect opportunity arose: I could buy and own my very own gym. And just like that, Vitality Training Studio was born!
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Fitness Designed for YOU
Small Group Classes
Experience the best of both worlds in our unique small group classes! You'll get the personalized attention of semi-private training, led by our certified trainers who genuinely know your goals and celebrate your progress, all within a supportive and fun community for every age and fitness level.
Accountability & Goal Setting
Done with fitness goals that don't stick? We'll work with you to define what's realistic and impactful for your life, then craft the plan to make it happen. We're more than just coaches; we're your unwavering accountability partners, providing the push you need and the gentle pull when life gets messy (we'll only think about that bundt cake next door!). Your success is our priority, and we're always ready to help you reset and refocus.
Our Certifications and Awards
Voted Top 5 Personal Trainers in Denver - 2020
Voted Best of the Best Workout/Fitness Center Littleton - 2023 & 2025
​"I’ve been training with Jacob...[and his] workouts not only improve my overall health but also make everyday tasks easier and their tailored plans have transformed my routine. What sets Vitality Team apart is their focus on functional exercises that directly benefit my day-to-day life, along with the personalized "homework" they provide to ensure continued progress outside of sessions. Their attention to detail and dedication makes them an exceptional trainer. If you are dealing with an injury, health issues, or working with a physical therapist, I highly recommend visiting and consulting with the Vitality team. They can create a personalized fitness plan tailored to your needs, and over time, you’ll begin to feel better and stronger. I highly recommend their services!"
"They Make Every Day Tasks Easier"
