endurance.science

All your training. Clear next steps.

Connect your data, understand what’s limiting you, and build a plan that adapts — with ES Coach grounded in your training and sports science.

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Intensity distribution analysis with ES Coach insights

Not a fitness tracker

Relationships across training blocks — not rings, streaks, or daily totals alone.

Not a static plan

Plans adapt with check-ins, progress, fatigue, and how training actually lands.

Not a generic AI chatbot

Every recommendation links to your data and published research — not vibes.

Devices

Connect the stack you already train with

Sync workouts and recovery from your watches, rings, and apps — or drop FIT files when you prefer a manual import.

  • Garmin
  • Polar
  • Suunto
  • Whoop
  • Strava
  • Oura
  • Apple Health
  • Health Connect
  • Fitbit
  • Ultrahuman
  • Samsung Health

Also supports FIT and Garmin export ZIP uploads.

One place

Everything about your training, together

Workouts, wearables, zones, documents, recovery, calendar, and goals in one record — so analysis and coaching run on the same truth.

  • Workouts & wearables Synced devices plus FIT uploads
  • Zones & thresholds Effective-dated physiology by sport
  • Documents Labs, schedules, plans, doctor notes
  • Goals & calendar Race targets, planned sessions, compliance

Deep analysis

See what is limiting you

Intensity distribution, load and fitness, correlations, thresholds, and shareable reports — finding patterns across blocks, not vanity charts.

  1. 01 Detected pattern
  2. 02 Likely cause
  3. 03 Recommended focus
  4. 04 Evidence support
Analysis · Intensity distribution
Weekly intensity distribution by heart-rate zone

ES Coach

A science-grounded coach, not a chat toy

ES Coach builds plans from your goals and history, adjusts them as training unfolds, tracks progress, and runs check-ins — using the same analysis tools you see in the app, with library citations.

ES Coach Same tools · library citations · your data
Build a 12-week plan for a sub-3:30 marathon. I have ~55 km/week available.

Draft built from your last 8 weeks, current thresholds, and a polarized distribution (Seiler). Peak long run 28 km in week 9; cutback weeks 4 and 8.

Plan draft · Marathon block 12 weeks · ~55 km average · check-in every Sunday

Evidence: intensity distribution & aerobic base before intensity ramp — matched to scientific literature.

HR drift on long runs is climbing. Adjust?

Yes — hold interval intensity steady for 3 weeks and extend two easy runs by 15 min. Expected: drift back under 6% if aerobic volume rises first.

  • Build from goals Plans from race targets, available volume, and your history — not a blank template.
  • Adjust with evidence When progress, fatigue, or life changes, the plan moves with receipts.
  • Track & check in Progress against the plan, regular check-ins, clear next actions.
  • Run real analysis Coach uses the same analysis registry as the app — then links reports.

Always with you

ES Coach on WhatsApp & Telegram

Feedback, check-ins, plan updates, and answers where you already message — the same coach conversation as the web app.

WhatsApp Check-ins and plan feedback in your everyday chat
Telegram Same ES Coach thread as the website — one conversation

Connect once. Ask about yesterday’s long run, confirm a plan change, or get a Sunday check-in — without opening another dashboard.

How it works

From data to a plan that keeps learning

The loop competitors leave open: insight, plan, execution, check-in, adjust.

  1. 01 Connect training data & documents Import history and context so coaching starts from your reality.
  2. 02 Understand patterns and limiters Analysis finds what is holding performance back — with evidence.
  3. 03 Build a goal-based plan with ES Coach Structure weeks from goals, available volume, and science-backed distribution.
  4. 04 Check in, track progress, adjust On the web, WhatsApp, or Telegram — keep the plan honest.

Built for

Athletes and coaches who train with structure

Athletes

Keep training in one place. See limiters clearly. Work a plan that adapts — with a coach that cites your data and research.

Coaches

Shared analytical surface and view-as athlete access — so you and your athlete look at the same evidence when deciding what changes.

Analyze, plan, and improve in one place

Connect your data, work with ES Coach on the web or messaging, and decide what to improve next — tied to sports science, not guesses.

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Recommendations tied to your data and sports science. AI can be wrong — double-check important decisions.