AI-Powered Periodization

Don't just train.
Train with purpose.

While other apps create single workouts, Phase generates complete, periodized training programs based on science—tailored to your goals, timeline, and progress.

Start Your ProgramLog In

Not another workout tracker. Phase is your training intelligence layer—create programs here, track workouts in Hevy (or your favorite app soon). Everything stays in sync.

12+
Weeks of Training
4-6
Training Phases
100%
Personalized
Training analytics and periodization visualization
Data-driven periodization

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 Builds Programs, Not Workouts

Based on proven periodization principles, Phase 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 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 adjusts future phases based on your progress and recovery.

Science of Periodization

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.

Progressive overload, intelligently dosed
Build workload gradually, then consolidate gains with deloads and tapers. This reduces plateaus and lowers injury risk.
Fatigue management is the multiplier
Adaptation happens when stress is followed by recovery. Planning phases helps you accumulate fitness without carrying fatigue indefinitely.
Specificity ramps at the right time
Early phases build a base. Later phases sharpen the exact qualities you need—strength, power, endurance, or race readiness.
Volume down, intensity up
Typical phase progression
BaseBuildIntensifyPeakVolumeIntensity
Supercompensation
Stress → recovery → higher baseline
BaselineFatigueAdaptationNew baseline
These charts illustrate common training principles. Phase adapts phase lengths and emphasis to your goal, schedule, and training history.

How Phase Works

From goal to achievement in four simple steps

1

Set Your Goal

Tell us your objective: run a marathon, hit a PR, build muscle, or lose weight.

2

Get Your Program

AI generates a complete, periodized training plan with phases optimized for your timeline.

3

Train & Track

Follow your daily workouts, log performance, and track progress through each phase.

4

Peak & Achieve

Arrive at your goal date in peak condition, ready to perform at your best.

Works with your favorite apps

Seamlessly integrate with your existing workout tracking tools and export your programs anywhere

Hevy Integration

Live

Sync your routines bidirectionally with Hevy. Create programs in Phase, track workouts in Hevy—everything stays in sync automatically.

  • Two-way sync
  • Real-time updates
  • Conflict resolution

Export Anywhere

Live

Export your complete training programs and individual workouts to use with any app or share with coaches and training partners.

  • Multiple formats
  • Full program export
  • Share with anyone

More Apps

Coming Soon

We're building integrations with more popular fitness tracking apps to give you maximum flexibility in how you train.

  • Garmin
  • Others

Ready to train with purpose?

Join athletes and fitness enthusiasts who are achieving their goals with science-based training programs.

Create Your Program