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A muscular person lifting a barbell, wearing a tank top with workout branding.

With X3, You Train With greater
Force
to Trigger Greater Gains

All you need to build muscle and burn fat is 10 minutes, an X3, and a 3x4 foot workout space.


Join over 300,000 people who have switched from weights to X3.

Choose your x3

X3 Was Featured In:

VARIABLE RESISTANCE TRAINING SYSTEM

X3 Fatigues Muscle Faster Than Weights

Weights overload joints and underload muscles, limiting muscle growth. Now, there’s a better way.



With variable resistance training and X3, you mirror your body’s natural strength curve: higher forces in your strong range and lighter forces in the weak range.



Variable resistance is the most effective way to build muscle, and X3 is the most powerful and effective variable resistance training system created.

More resistance where your body is stronger

Complete muscle fatigue for greater muscle gains

Over 600 pounds of available force

Full-body muscle-building workouts

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Dr. Jaquish coaching NFL Hall of Famer Terrell Owens on variable resistance training with X3

About the Inventor

John Jaquish, PhD, is a Wall Street Journal best-selling author of Weightlifting Is a Waste of Time. He is the inventor of OsteoStrong, a bone-density-building medical device that has reversed osteoporosis for thousands and created more powerful, fracture-resistant athletes across 300 clinics worldwide.

While researching bone density, Dr. John Jaquish discovered a sevenfold difference between the weakest and strongest ranges in weight lifting. The discovery led to the invention of X3, the ultimate muscle-building system.

Dr. Jaquish’s latest invention, X3 Force, adds real-time force tracking and data-driven workouts to X3’s proven variable resistance training methodology.

Dr. Jaquish is also a research professor and a nominee for the National Medal of Science.

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Dr. John Jaquish’s 365-Day Transformation

Like many others, Dr. Jaquish spent hours in the gym every week to look moderately fit.


Eventually, he developed a better way of working out after years of injuries and frustration.


In two years, he put on over 45 pounds of muscle simply by training with the X3 system, supplementing his protein intake with Fortagen, and streamlining his diet.

Three photos of a man's body transformation, labeled 'day 1,' 'day 180,' and '1 year later.'

Dr. Jaquish’s actual progression when using only the X3 prototype for 1 year.

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TRAIN LIKE AN ATHLETE

Trusted by the World’s Best Athletes

Weight lifting causes joint damage and limits strength-building potential. For many elite professional athletes and championship teams, the injury risk is too high—and the returns are too low.



More and more athletes are turning to X3 to build muscle and increase strength. It’s the workout system of choice for football great Terrell Owens, MMA legend Forrest Griffin, and the NBA’s Miami Heat.

Alex Anzalone

NFL

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10 Minutes is All You Need

Lift Heavier With Less Risk of Injury

A Full Gym Without a Gym

Workout Anywhere

An All-in-One Home Gym

X3 Bar – This Olympic-style bar, made of machined anodized aluminum, has internal bearings to optimize grip, a solid steel center shaft, and stainless steel hooks, allowing you to lift over 600 pounds of force.


Upgrade your X3 Elite to X3 Force to measure your real-time force under variable tension and repetitions, offering a precise view of your exercise performance.

Custom Engineered Resistance Bands – Includes heavy-duty resistance bands made with 15 latex layers, which can provide over 600 pounds of resistance.

Heavy Duty Steel Ground Plate – Protects your ankles from high forces produced by X3.

Exclusive Access to the X3 12-Week Program – With detailed videos covering all aspects of the X3 12-Week Program, you can master each exercise movement to get the most from variable resistance training.

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X3 12-Week Workout Program

The X3 12-week workout and nutrition programs are only available for X3 customers. Start this push-pull split routine to build muscle, increase strength, and transform your body. Follow the X3 Program and discover how strong you can be in just 10 minutes a day.

Guidance on exercise form and technique

Simple methods for accelerated strength training

Tips on when to exercise and when to rest

Nutritious meals with little to no prep

Help from tens of thousands of X3 users in the X3 Facebook communities

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X3 12-Week Workout Program

The X3 12-week workout and nutrition programs are only available for X3 customers. Start this push-pull split routine to build muscle, increase strength, and transform your body. Follow the X3 Program and discover how strong you can be in just 10 minutes a day.

10-Minute Workout

Joint Friendly

600+ pounds of resistance

Portable

Measure Real-time Force

Data-driven workouts

X3

'X3 barbell with resistance bands and ground plate for home gym workout.'

Free
Weights

Pair of metal hexagonal dumbbells on a plain background.

Resistance Band Packages

Rubber bands with a glitchy background.

Tempo

Exercise machine with digital screen showing a workout video of a woman lifting weights.

Tonal

Red anti-break elastic rope with black straps and metal hooks on white background.

Digital Dumbbells/ Kettlebells

A set of adjustable dumbbells on a stand.

Other "Smart" Gyms

Modern slim design tower fan.

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X3 BAR RESULTS

X3 Bar Results: Before and After

Measure Your Real-Time Force by Upgrading X3 to X3 Force

X3 Force, an optional upgrade from X3 Elite, quantifies the intensity of every rep, calculates time under variable tension, and helps you improve overall workout quality. Use live Total Force measurements to unlock unparalleled training insights.

View real-time force data across different rep cadences

Improve rep consistency

Compete against your previous Total Force

Maximize Your Muscle Growth With X3 Force

Choose X3 Force, and with every workout, you’ll challenge your past performance, tracking your Total Force rating. This dynamic metric harnesses real-time force data to measure both the time under variable tension and the overall quality of your workout. This data ensures you’re constantly optimizing your training to stimulate maximum growth.

Real-time Force Tracking

X3 Force measures your real-time time under variable tension and repetitions, offering a comprehensive view of your exercise performance.

Total Force Rating

Your ultimate performance metric, calculated by combining force sensor data with time and rep count information. It will help you quantify exercise difficulty and quality to watch your progress.

Data-driven workouts

With X3 Force, you'll access data-driven workouts that empower you to push your limits and achieve superior results. Each session will help you compete with your previous Total Force, ensuring