Small-group strength training · Scottsdale, AZ
Build muscle, protect bone density and stay strong for decades — proven by your assessments.
No commitment. A coach will call you back — usually the same day.
From members and practitioners
“I really love the gym environment, but I’m there to build muscle and that’s exactly what I have seen. I replaced many of my Pilates classes with proof3, and I couldn’t be happier about it.”
Marcy Morrow · Real Estate Technology
“I am a practicing chiropractor, and many fitness gyms ask me to try their gyms out, but I was blown away by proof3’s assessment and coaching philosophy. I will be recommending proof3 to my patients for sure.”
Jarryd Leung · Founder, CanAm Sports Medicine
Why people come to us
That isn't the hard part. Nearly everyone who walks through our door has known it for a while. What stopped them was never the idea, it was getting started and staying with it.
“I'm afraid of getting hurt.”
“I don't know how to do it.”
“I need help and coaching to do it right.”
“I've never done it before, and I don't know what I'm doing.”
“I just can't stay consistent.”
Those are the five things people actually say. Not one of them is about motivation. They're all about not knowing how to start effectively and progress perpetually.
So nobody trains here until we've measured how you move, what you can produce, and where you are today. Then a coach builds around it.
What finally compels people
Fifty. Sixty, … A number that turns a someday into a decision.
The scan
A DEXA or InBody at the doctor's office showing muscle mass or bone density falling — or the words sarcopenia, osteopenia, osteoporosis. Numbers are harder to ignore than a feeling.
The moment
A suitcase into an overhead bin. Getting off the floor without thinking. Knees that seem to ache for no reason. A hill that didn't used to be a hill.
The medication
The weight comes off either way. Whether lean mass goes with it depends almost entirely on whether you're lifting — and whether anyone is measuring.
What small group means here
In a typical group class, one instructor runs the same workout for everyone. The room is chaotic, confusing, risky, and not designed for specific and perpetual progress. You're a body in a room.
Here, a coach knows your assessment results, sets your working weights, watches how you move, and adjusts mid-session. The group is small, the coaching is personalized and constant, and the results are measured.
It isn't personal training. Most adults over 40 don't need a bored personal trainer who just looks at their phone during their sessions. They need one who's paying attention, making changes when they matter — and they need the energy and accountability of the coach and the people around them.
An hour, start to finish
Thirty minutes of strength. Thirty minutes of endurance. A coach who knows your name and so much more about how you move and make progress.
Your first week
InBody body composition, computer-vision movement screening, and strength and power testing — producing your prf score, one number you can track over time.
One-to-one with a coach who walks you through your results and the movements you'll be doing — before you ever step into a group.
What you do outside the gym decides most of your result. You leave with a plan for eating, sleep and recovery that fits your actual life.
Small-group sessions with strength and endurance coaching built around what the assessment found.
Measured, not guessed
Most gyms may ask how you feel. We ask you how you feel, and we reassess you — same tests, same equipment, same conditions — so progress is a number that moved, not a sense that something might be different.
Body composition. How you move. What you can produce. Three measurements, one score, tracked from your first day.
Who you'll train with
A coach who yells at you to go harder misses the nuances that count. Coaches who notice your left hip dropping when you squat and who know how to get specifically you to fix it is worth its weight in gold.
Coach · Founder
CEO, global coaching educator, five-time gym owner, lifetime coach. Penn State tennis, CrossFit Games athlete. A world-class coaching eye and the ability to connect the dots with people.
Head Coach
Husband, father, weightlifter, esports athlete and nationally ranked West Coast Swing dancer. If you want as much education as entertainment, Jon's your guy.
Coach · Researcher
Researcher in physiology, concussion and weight loss, particularly for underserved populations. Deep history in fitness coaching and horseback riding, and a gifted engager of people.
Coach
Scottsdale native who has spent years deeply rooted in nutrition, fitness and longevity. Carter is gifted at connecting with others and relentlessly driven to guide people to their optimal goals.
A member story
What it costs
$249–$299
per month, after your first 30 days
Your first 30 days are priced separately, because they include more: two coached proof3 Assessments and reviews, a private 60-minute training session, a nutrition and lifestyle strategy built for you, and 30 days of small-group training.
A coach will walk you through the numbers on your call. No surprises.
Common questions
Coached strength training in a group of never more than 12 people — often fewer — where the programming is individual rather than shared. At proof3, your working weights and progressions come from your own proof3 Assessment, and a coach adjusts them during the session. It sits between a fitness class, where everyone does the same thing, and one-to-one personal training.
That's the most common thing we hear, and it's why the assessment comes first. We screen how you move before anything gets heavy, your starting weights come from your own testing rather than a class average, and a coach watches your setup during every session.
After the first 30 days, most members at proof3 invest between $249 and $299 per month for unlimited small-group training, ongoing assessments, personalized coaching and the tracking technology. The first 30 days are priced separately because they include the proof3 Assessment, a private 60-minute session and a nutrition and lifestyle strategy.
No. The assessment exists precisely so nobody has to guess where to begin. Most people who start with us haven't trained seriously in years, or have never lifted with a coach watching. You start where you are.
Yes, and it becomes more important with age, not less. Adults lose muscle mass steadily from their 30s onward, and resistance training is the most direct way to slow that. The risk comes from loading a movement pattern that isn't ready — which is why we screen how you move before anything gets heavy.
Yes, and this is a growing reason people come to us. Rapid weight loss on a GLP-1 takes lean mass along with fat unless you're training for strength and eating enough protein. Because we measure body composition rather than just weight, you can see whether what you're losing is fat or muscle — and adjust while it still matters.
We offer both. One-to-one gives you a coach for every repetition and suits people managing a specific injury or chasing a narrow goal. Small group gives you individual programming with a coach watching the room, at a lower cost, with other people training alongside you.
Sixty minutes. Our 30/30 session is 30 minutes of strength work followed by 30 minutes of endurance. Base40 is a dedicated endurance session, also 60 minutes.
9220 East Vía de Ventura, Suite 121, Scottsdale, AZ 85258 — in the Salt River area, convenient to north Scottsdale, Paradise Valley and northeast Phoenix.
Book your assessment
Fill this in and a coach will call you back — usually the same day — to answer questions and book your proof3 Assessment. No commitment, no pressure.
Start here
You'll leave knowing your body composition, how well you move, where you're strong and where you're not — whether or not you train with us.
Book your assessment
