We’re not a gym. We’re the first of our kind.

You’ve never trained like this — because until now, you couldn’t.

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Client Testimonials

After years of going to the gym, trying various personal trainers, and even physical therapy for sports injuries, I hesitated to try this. I usually don’t write reviews, but this has been such a game-changer for me. The technology of their machines, combined with the knowledge and support from their staff is phenomenal. The physical strength and fitness goals that I have been able to achieve in such a short time are amazing. The benefits have been incredible and have far outweighed anything I have been able to achieve on my own. The targeted eccentric training really does make all the difference in taking your fitness/athletic goals to the next level. A short session gives results equal to hours at the gym. I highly recommend anyone to book a free session and see for yourself!

Ava K.
Entrepreneur

I am recovering from ACL surgery and there is no better place to gain back strength than here. John has been very helpful setting up my exercises to optimize strength gains even while under the restrictions of my knee not being able to do regular free weight training. Thanks to him I am way ahead of the game and I’m recovering faster than ever.

Paul H
March 2024

ALL-IN-15 is the BEST decision I've made for my health and my life. It is the 'YES' you will be forever grateful for! It's hands down the best training to reach your goals.

Riley S.
Athlete

I'm the healthiest I have been in years! Joining ALL-IN-15 has been one of the best health decisions I've ever made to improve my well-being

Alicia D
CEO
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Our Workouts Build Muscle. Most Just Keep You Busy.

You’ve been loyal to the grind. But loyalty doesn’t equal progress. You don’t need to try harder. You’ve given your time, your energy, your trust.

Now give yourself results — with ALL IN 15: the most advanced way to build muscle that exists.

Eccentric Training

Proven by science as the best way to build strength.

Safety First

Revolutionary Technology keeps you safe while pushing you hard.

More Energy

With more muscle comes more energy to do the things you love.

A Faster Metabolism

The more muscle you have, the more calories you burn.

Longer Vitality

The stronger you are, the longer you live.

Transformative Data

Data every rep proves you're getting stronger.

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Why ALL IN 15?

  • Push Your Limits — Without Risk
  • One Session a Week. Real Results.
  • Smarter Than the Gym. Built for Humans.

This isn’t a shortcut. It’s the next evolution of training — where data, science, and your potential finally align.

Training Technology

Why Once per Week?

1. Maximum Load = Maximum Recovery

With eccentric training, your muscles handle 2–3x more load than traditional training. That intensity creates deep stimulus — and your body needs time to adapt. More sessions? They’d just slow recovery and reduce gains.

2. Eccentric Training Is Exponential

Unlike basic lifting, eccentric training activates more muscle fibers, drives more neurological adaptation, and stimulates strength at a much deeper level. That’s why one properly loaded session can outperform multiple traditional ones.

3. You Don’t Grow in the Gym — You Grow After

Muscle, strength, and resilience are built between sessions. One intelligently designed, machine-optimized session gives you the growth stimulus you need — and gives your body the space to make it count.

4. No Guesswork. No Junk Volume.

Traditional workouts are full of wasted reps, bad form, and "just enough" effort. Our AI-driven system maximizes output from rep one. You leave with nothing left to give — and nothing else needed.

5. Because You’ve Got a Life

One session. Thirty minutes. Strength that fuels everything else you care about — your career, your family, your passions. We don’t take your time. We give it back to you.

Our Services

The ALL IN 15 Difference

We’re not the alternative. We’re the answer.
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Kineo Intelligent Load

Here’s what makes us different:
  • No One Trains You Like We Do.
  • No Other System Rewards You Like Ours.
  • One Session. Better Results than an Entire Week at the Gym.
  • This isn't a Trend. It's the Apex of Training.
  • We Care More. Period.
No More:
  • No more wasted hours.
  • No more injuries from chasing progress.
  • No more guessing what works.
  • No more workouts that take and never give back.
  • No more trainers who treat you like a number.
  • No more slow progress. No more dead ends.
  • No more settling for “good enough.”
  • No more pretending the old way works.
  • No more training around your fear — now you train past it.
  • No more hoping for results — this time, it’s guaranteed.

No more wasted effort. No more broken systems. No more holding back. This is strength — redefined, refined, and delivered the way it was always meant to be.

Your First Session is On Us

ALL IN 15. Built by design. Fueled by purpose. Ready when you are.

Book Now
Blog

News & Articles

Learn from experts and understand the proper techniques to focus on your calisthenics

All Blogs
Training
The Overlooked Secret to Athletic Success: Eccentric Training for Peak Performance

Discover the untapped potential of eccentric training, the "overlooked secret" to athletic success. Unlike traditional strength training, eccentric exercises focus on the lowering phase of movements, where muscles stretch under load. This innovative approach boosts muscle growth, enhances power, and reduces the risk of injury—all critical for elite athletes striving for peak performance.

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Training
Unlocking Muscle Balance: Your Guide to Strength, Stability, and Peak Performance

At ALL-IN-15, we believe muscle balance is critical for functional strength and injury prevention. Using advanced Kineo Intelligent Load Machines, our Greenwood Village facility provides personalized eccentric training that targets both strength and stability. In just one 15-minute session per week, achieve muscular symmetry, reduce injury risk, and enhance performance. Discover a smarter way to train. Contact us for a free evaluation!

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Health
A Key to Aging Well: Increasing Bone Density

Bone density declines as we age, increasing the risk of fractures and conditions like osteoporosis. Fortunately, with the right approach, bone density can be increased even in older adults. This blog explores how resistance training, particularly eccentric training, helps strengthen bones, improve mobility, and ensure longevity.

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