Adaptive coaching for endurance athletes

Personalised training that evolves with you. Affordable, intelligent and designed specifically for cyclists, runners and triathletes.

Plan adapted

Missed Monday · week rebalanced

This week

80% easy · 20% hard

Built for

What makes us different

A coach in your pocket, not a template in a spreadsheet.

Athlethium combines proven training methods with modern technology to deliver coaching that's both effective and affordable.

Your plan reacts to what actually happened: completed sessions, missed days, how you're feeling. Every week is rebuilt around you.

A proven polarised model balances intensity and recovery for bigger endurance gains and fewer injuries.

Structured training algorithms combined with LLMs: reliable plans, flexible adjustments and human-like coaching conversations.

Gym and mobility sessions sit alongside your endurance work. Log sets in the app or import them from your watch.

Connect Strava or upload FIT files. Completed workouts flow straight into your plan, with stats that suit each sport.

The app and your coaching notes are available in six languages, and follow your phone's language automatically.

World-class, adaptive coaching at a fraction of the cost of a traditional coach, with no compromises.

How it works

01
Tell us your goal

Your event, your sports, the hours you have each week and anything that's holding you back.
02
Get your plan

A periodised, polarised plan built around your calendar, with clear targets for every session.
03
Train and adapt

Record your sessions and sync them. Athlethium adjusts the weeks ahead as you get fitter.

Built by a former GB cyclist with real-world knowledge of what it takes to train and perform at the highest level.

Expert experience, in every plan.

Download Athlethium on iOS or Android and get your first plan in minutes.