What you get
Train Arc reads each workout once and keeps everything that follows from it in step: your load, zones, records, recovery, and the plan for the week.
Load & form
Every workout's TSS, or heart-rate TRIMP when there's no power meter, feeds a 42-day fitness and a 7-day fatigue average. Form is the gap. Train Arc also compares your last 7 days of load with the 21 before, and tracks monotony and strain.
Recovery
A daily readiness call from your training load, sharpened by WHOOP or Garmin HRV, sleep, and resting heart rate when you connect them.
Zones & records
Heart-rate and power zones come from your own thresholds. Mean-max power curves and personal records update with every upload.
Planning
Put structured workouts on your calendar. When a session arrives, Train Arc matches it to the plan and shows how closely it followed.
Analyzer
Overlay power, heart rate, and speed from different devices on one aligned timeline and see which sensor to trust.
Sync & files
Connect Strava, Garmin, or WHOOP, or upload FIT, TCX, and GPX files. Train Arc keeps every original, spots duplicate recordings of the same workout, and lets you download your files any time.
Athletes and coaches
Train on your own, coach a roster, or both. Each mode puts its own tools first, and one rule holds in both: athletes decide what a coach can see.
Athlete mode
Everything you record in one place: load, zones, records, recovery, and the plan for the week.
Coach mode
Invite athletes to your workspace and work from what each one chooses to share.
How it works
Setup takes one upload or one connection. After that, every new session updates the picture.
Upload FIT, TCX, or GPX files, or connect Strava, Garmin, or WHOOP and new sessions arrive on their own. Your original files stay downloadable.
Your FTP, threshold heart rate, and pace set your zones and the load of every session. Change them and Train Arc recalculates.
Check fitness, fatigue, and form before a hard day, put the next sessions on your calendar, and ask Coach when you want a second opinion.
Yes. Train Arc is in public beta and every feature is free while the beta runs. You don't need a credit card to sign up.
Anything that exports FIT, TCX, or GPX files, which covers most watches, bike computers, and training apps. You can also connect Strava, Garmin, or WHOOP so new sessions sync automatically. Your original files stay downloadable.
Fitness (CTL) is a 42-day weighted average of your daily training load, and fatigue (ATL) is the 7-day version. Form (TSB) is fitness minus fatigue: negative while you're building, positive when you're fresh. Each session's load comes from power-based TSS on rides with a power meter, or from heart-rate TRIMP scaled so an hour at threshold scores 100.
Train Arc gives a readiness call based on your recent load, and adds WHOOP or Garmin recovery data such as HRV, sleep, and resting heart rate when you connect them. It's a training heuristic, not medical advice, and it shows the evidence behind each call.
Only if you join their Coach workspace. You choose what they can see, such as activities, calendar, or goals, and you can revoke access at any time. You can also share a single workout or analyzer comparison as a read-only link.
An AI chat that reads your workouts, trends, plans, and goals before it answers. In Coach mode it can draft calendar changes for an athlete, and nothing changes until the coach reviews and applies them.
Yes. Add the Train Arc connector in ChatGPT to ask about your training there. It reads your data with the access you grant, and it can add planned workouts to your calendar only if you allow it.
Train Arc runs in the browser on phone, tablet, and desktop, so there's nothing to install.