The science-backed
hybrid training app.
Driven by discipline.
One app that trains every part of your fitness — built on sports science, not trends.
Join the waitlist for early access · 14-day free trial · 50% off first 3 months
The fitness industry told you to pick a lane.
But your body was designed for hybrid fitness—strength, endurance, mobility, and power working together. Relentlx is built for exactly that.
Resistance
Build muscle with weighted or bodyweight exercises. Increase bone density. Create the foundation your body needs to perform in everyday life and sport.
Cardiovascular
Your heart is a muscle too. Endurance training improves longevity, energy levels, and your body's ability to recover.
Mobility
Mobility is freedom. Prevent injuries, improve range of motion, and move through life without limitations.
Power
Power and explosiveness. Train your fast-twitch muscles for athletic performance and functional strength.
Most apps focus on one. Relentlx lets you master all four.
Everything You Need to Train Without Limits
One app for every workout, every program, every goal.
Program Building, Perfected
Create professional-grade training programs with periodization that actually works.
"This is the program builder other apps wish they had."
Train for Any Goal
Build programs for hybrid training, race day, bodybuilding, or anything else you can imagine. Start with our templates or create your own.
Hybrid Fitness
Strength meets cardio
8-24 week programs
The trending approach combining lifting and running. Build muscle while improving your engine.
- Strength + running integration
- Concurrent training periodization
- Customizable balance ratios
Running Programs
5K to Ultra Marathon
8-20 week programs
From your first 5K to ultramarathon glory. Structured training for every distance.
- 5K, 10K, Half, Full, Ultra templates
- Pace-based training zones
- Taper and race-day protocols
Strength & Bodybuilding
Build muscle, get stronger
8-16 week programs
Classic hypertrophy and strength programs. From beginner to advanced lifters.
- Hypertrophy & strength cycles
- Progressive overload built-in
- Powerlifting & physique templates
HYROX Ready
16-week program
Running + functional fitness stations. From first-timer to podium.
- 8 station prep
- Race simulation
CrossFit Performance
12-week cycles
Constantly varied functional movements. Build your engine.
- WOD programming
- Skill progressions
Ironman Journey
20-week build
Swim. Bike. Run. Conquer the ultimate endurance challenge.
- Triathlon periodization
- Brick workouts
Don't see your goal? Build any program from scratch with our powerful program builder.
Train With a Community That Gets It
When you train with intention and purpose, you become the example. Your family notices. Your friends ask questions. You become the person others look to for guidance.
Join the waitlist for early accessThe Future of Intelligent Training
AI that understands your body, your goals, and your life.
AI Workout Assistant
Talk to your coach the way you'd talk to a person. Tired? Traveling? Slept badly? Just say so—and your program reshapes itself on the spot. The AI reads context, adjusts intensity, swaps exercises, and keeps you progressing no matter what life throws at your week. No manual edits. No guesswork. Just show up.
- Just describe how you feel — no forms or menus
- Program adjusts instantly around your day
- Swaps exercises based on energy or equipment
- Gets smarter and more personal the more you train
Injury Prevention Intelligence
Log your injuries, past surgeries, or that nagging shoulder pain once—and your AI coach never forgets. Every session is built with your limitations in mind. Instead of stopping when something hurts, your program routes around it with safe substitutions, adjusted load, and recovery-first scheduling. Train consistently, heal faster, and never lose momentum to an injury again.
- Full injury history stored and referenced automatically
- Daily ache and pain tracking with trend alerts
- Safe exercise substitutions that keep you moving
- Recovery-first load management that protects your gains
Health Intelligence Hub
Your lab reports hold the truth about your body—and now your coach can read them. Upload blood panels, vitamin levels, or hormonal markers and your AI stores, interprets, and acts on every result. One secure place for your entire health history, and a training program that actually responds to what your numbers say.
- Upload any lab report — AI reads results instantly
- All reports stored and searchable in one place
- Automated reminders for your next test or panel
- Workouts adapt dynamically as your health data updates
Waitlist members get priority access to Version 2
Why People Are Switching to Relentlx
We built what other apps couldn't—or wouldn't.
One app. Every workout. No compromises.
Getting Started is Simple
From sign-up to your first personalized program in minutes
Create Your Profile
Tell us about your training background, goals, and preferences. Whether you're a powerlifter, runner, or complete beginner—we adapt to you.
Build Your Program
Use our powerful program builder to create your perfect training plan, or choose from our library of competition-ready templates.
Train & Progress
Execute your workouts, track every rep, and watch the data. Your charts will tell the story of your transformation.
If not now, when?
Join the waitlist and be first to experience training without limits. Early members get a 14-day free trial + 50% off your first 3 months.