Don't just train.
Train with purpose.
phase.fitness plans strength, cardio and calisthenics in one periodized program — built in phases, and rebuilt each phase from what you actually did. Not a workout a day: a plan you can see, on a calendar, before you start it.
Help us break it. Report bugs and rough edges and we'll give you Pro free — 100 credits a month, every feature unlocked.
Not another workout tracker. phase.fitness is your training intelligence layer—create programs here, track workouts in Hevy, Liftosaur, or your favorite app. Everything stays in sync.
The Problem with Random Workouts
Most fitness apps give you isolated workouts. You train hard, but without a structured plan, you:
- Hit plateaus and stop making progress
- Overtrain or undertrain without knowing it
- Never peak when it matters most
phase.fitness Builds Programs, Not Workouts
Based on proven periodization principles, phase.fitness creates complete training programs that:
- Systematically build toward your specific goal
- Balance stress and recovery intelligently
- Time your peak performance perfectly
Built on Science, Powered by AI
phase.fitness combines evidence-based periodization with AI to create personalized programs
Goal-Driven Programs
Preparing for a race? Building strength? Losing weight? Our AI designs complete programs around your specific objective and timeline.
Periodized Phases
Each program is divided into strategic phases: base building, intensification, peak, and recovery—all timed for optimal adaptation.
Adaptive Intelligence
Your program evolves with you. Log your performance, and phase.fitness adjusts future phases based on your progress and recovery.
A structured plan beats motivation
Periodization is the intentional sequencing of training variables—volume, intensity, frequency, and specificity—so your body adapts while managing fatigue.
How phase.fitness Works
From goal to achievement in four simple steps
Set Your Goal
Tell us your objective: run a marathon, hit a PR, build muscle, or lose weight.
Get Your Program
AI generates a complete, periodized training plan with phases optimized for your timeline.
Train & Track
Follow your daily workouts, log performance, and track progress through each phase.
Peak & Achieve
Arrive at your goal date in peak condition, ready to perform at your best.
Just landed
Three things that change how you start a program, where you train, and what your watch knows about it.
Template library
Start from something that already works. Ready-made programs and sessions, anything you’ve built saved as your own, and a public library of what other people actually train with.
- Drop a template session straight into a phase — your calendar follows, and it costs no AI credits
- Save any program or session as a snapshot; editing the original never changes it
- Publish to share it, or keep it private — your call, reversible any time
Garmin, both directions
Connect Garmin Connect once. Sessions land in phase.fitness the moment your watch syncs, and the workouts the AI planned are waiting on your wrist before you start.
- Activities arrive by push, not polling — nothing to remember, no sync button to hit
- Cardio and strength sessions pushed to Fenix, Forerunner and Edge
- Sleep, body battery and recovery feed the next block the AI writes
A web app, deliberately
phase.fitness is a PWA — you add it to your home screen from the browser and it opens full screen, like any other icon. There is no native app, and that is a choice rather than a gap.
- You plan a block once or twice a week, not every day — that rhythm doesn’t justify an app store download and an update every fortnight
- Your sets get logged where you already log them: Hevy, your Garmin, or the built-in player for bodyweight work
- It opens straight to Today, remembers you, and shows a real page instead of a browser error when the signal drops in the gym
Works with your favorite apps
Seamlessly integrate with your existing workout tracking tools — strength, cardio, and wearables
Hevy
LiveTwo-way sync for strength routines. Create programs here, track in Hevy — everything stays in sync.
- Bidirectional sync
- Conflict resolution
Liftosaur
LiveTwo-way sync for strength training. Phase programs are pushed as Liftoscript and your logged workouts flow back in.
- Liftoscript program push
- Workout history import
Strava
LiveImport your training history from Strava. The AI analyzes your activities to build a comprehensive athlete profile.
- Activity import
- AI athlete profiling
Intervals.icu
LivePush cardio workouts to Intervals.icu with structured intervals and HR zones. Gateway to all major sports watches.
- Cardio push sync
- Wellness data import
Garmin
LiveConnect Garmin Connect and your watch syncs both ways: sessions land in phase.fitness the moment you finish, planned workouts land on your wrist before you start.
- Activities import automatically
- Cardio and strength pushed to the watch
- Sleep, body battery and recovery
Export
LiveExport complete programs and workouts in multiple formats. Share with coaches or use in any app.
- Multiple formats
- Full program export
From AI to your wrist
phase.fitness creates the workouts. Garmin gets them directly; through Intervals.icu they also reach Suunto, COROS, Apple Watch and the rest.
Device sync powered by Intervals.icu — a powerful open training platform that connects to all major sports watches and bike computers.
Your training history becomes your advantage
phase.fitness uses advanced AI memory to analyze all your past workouts and create programs specifically tailored to your unique training patterns, strengths, and recovery needs.
How phase.fitness AI Creates Your Workouts
Our AI doesn't just generate random workouts. It synthesizes multiple data sources to create personalized training plans that evolve with you—combining exercise science, your strength data, training history, and real-time feedback into intelligent programming.
Every workout you complete feeds back into the AI, creating a feedback loop that makes each subsequent program more accurate and effective.
The AI leverages our curated knowledge base of exercise science, periodization principles, and proven training methodologies.
Simple, transparent pricing
Start free. Upgrade when you want the AI to plan the whole cycle.
Free
Enough to see whether the plans suit you.
- Track your workouts
- Up to 3 programs and 10 routines
- 5 AI generations a month
- Full exercise library
- Bodyweight skill roadmaps
PRO Quarterly
Works out at $11.63/month
One full cycle: base, build, peak.
You pay $34.90 today, then $34.90 every 3 months.
- AI programs periodized into phases
- Phase analysis that shapes the next block
- Sync with Hevy, Strava, Intervals.icu, Garmin and Liftosaur
- Workouts pushed to your Garmin watch
- Template library — save, reuse and share programs
- Progressive workload and wellness tracking
- Unlimited programs and routines
- Extended AI usage
- Priority support, and every feature we ship next
PRO Annual
Works out at $8.72/month — you keep $34.90
Twelve months for the price of nine.
You pay $104.70 today, then $104.70 every 12 months.
- AI programs periodized into phases
- Phase analysis that shapes the next block
- Sync with Hevy, Strava, Intervals.icu, Garmin and Liftosaur
- Workouts pushed to your Garmin watch
- Template library — save, reuse and share programs
- Progressive workload and wellness tracking
- Unlimited programs and routines
- Extended AI usage
- Priority support, and every feature we ship next
Why we bill every three months
Because one month can't show you what Phase actually does. A single month is one training block — and one block is the part you could have written yourself.
A block is four weeks. A cycle is three blocks.
Phase writes periodized programs: a base block, a build block, a peak. Each one has a job, and the job only makes sense next to the other two. Buying a month buys you the first chapter.
The AI learns from what you actually lifted.
At the end of a block Phase reads your real sessions — loads, RPE, what you skipped — and writes the next block from them. That handoff happens between blocks, so in one month it never happens at all.
Adaptation takes longer than a billing cycle.
Strength, work capacity and recovery move on a scale of months, not weeks. Three months is the shortest window where the graphs start telling you something you didn't already know.
So we don't sell a month. Three months is the smallest amount of Phase that's actually Phase — and if it isn't for you, you cancel and you're not billed again.
What if I don't like it?
Cancel whenever you want and you're never billed again — you keep PRO until the end of the three months you already paid for. What we won't do is charge you for a month, hand you a third of a training cycle, and let you judge us on it.
How it works, in more detail
Three questions worth answering before you build anything.
Lifting and endurance in the same week, ordered so they add up instead of cancelling out.
Read itWhat a training phase is, why it lasts four weeks, and what the AI does when one ends.
Read itMuscle-up, front lever, planche — programmed with sets and holds, not just attempted.
Read itReady to train with purpose?
Join athletes and fitness enthusiasts who are achieving their goals with science-based training programs.
Create Your Program