Questions, answered.
What is Harlen?
Harlen is an intelligence layer for high-touch personal training. It reads every client's wearable, lifestyle, training, and check-in data against that client's own baseline, then tells the coach who needs attention, what changed, and what to adjust. The coaching decision comes first; the data sits beneath it as evidence.
Who is Harlen for?
Harlen is built for personal trainers and strength coaches who run a roster of clients and already track wearable data. It is most useful for coaches managing more clients than they can hold in their head, who want to keep individual attention without spending hours reading raw data each morning.
What does Harlen actually do for a personal trainer?
Harlen scans a coach's whole roster before the first session of the day and surfaces the clients who have drifted from their own normal. For each one it explains what changed, the likely reason, and what to adjust in the next session, with the data sources cited. The coach walks in already knowing where to look.
What is Restoration in Harlen?
Restoration is Harlen's recovery readiness score for a client, measured against that client's own history rather than a population average. When it dips below a client's baseline, Harlen flags it so the coach can adjust volume before the client trains tired. We use the term Restoration to keep it distinct from any single wearable's branded readiness metric.
Which wearables and apps does Harlen work with?
Harlen reads from Garmin, Apple Watch, Oura, Whoop, Coros, Withings, and Polar, plus the lifestyle and training data a coach logs directly. Whoop data syncs through Apple Health rather than a native connection. If a client wears a device that writes to Apple Health, Harlen can generally read it.
Does Harlen work with Whoop?
Yes. Whoop users can connect by syncing their Whoop data into Apple Health, which Harlen reads. Harlen does not have a native Whoop integration, but the Apple Health path covers most of the metrics a coach needs.
Does Harlen work with Oura, Apple Watch, and Garmin?
Yes. Oura, Apple Watch, and Garmin are all directly supported. Harlen pulls recovery, sleep, heart rate, training load, and activity data from these devices and reads each metric against the individual client's baseline.
What data does Harlen use to understand a client?
Harlen combines four kinds of input: wearable data (recovery, sleep, heart rate, training load), lifestyle context (stress, travel, nutrition), what the coach logs (notes, check-ins, programming), and the client's own history. It connects these into one model per client rather than showing them as separate dashboards.
Is my clients’ data private and secure?
Yes. Client data is used only to power the coaching reads inside a coach's own account and is never sold. Harlen is in private beta and we are happy to walk through our data handling in detail on a demo call.
How is Harlen different from a dashboard like TrainingPeaks or a spreadsheet?
A dashboard shows you data and leaves the interpretation to you; Harlen makes the read. Instead of scanning charts to figure out who needs attention, you get the conclusion first, with the supporting data underneath. It is a decision layer, not another set of graphs to interpret.
Is Harlen just a ChatGPT wrapper or an AI chatbot?
No. Harlen is one connected system that builds a model of each client over time and reasons over the whole picture, not a chatbot pointed at a database. It remembers what it learns about a client, grounds every read in that client's baseline and in peer-reviewed research, and you can ask it questions in plain language as one part of that system.
Does Harlen replace the coach?
No. Harlen does the reading so the coach can make the call. It surfaces what changed and suggests adjustments, but the coach decides what to do. The goal is to scale a coach's judgment across more clients, not to remove it.
How does Harlen use AI?
Harlen uses AI to connect each client's signals into one model, detect meaningful change against their baseline, and explain it in plain language. Every read is tied back to the underlying data and to peer-reviewed research, so the AI's output is traceable rather than a black box.
Can I ask Harlen questions about my clients in plain language?
Yes. You can ask Harlen about any client the way you'd ask an assistant who has watched them for months, and get a synthesized answer grounded in that client's real data with the sources shown. There is no query syntax to learn.
Can Harlen help write training programs?
Yes. Harlen can draft programming informed by a client's recovery, training load, and history, which the coach then edits and approves. It is built to fit how coaches already plan blocks and sessions, not to hand over programming wholesale.
Does Harlen give medical advice?
No. Harlen surfaces patterns in training and recovery data to support coaching decisions; it is not a medical device and does not provide medical advice or diagnosis. Coaches should refer clients to qualified medical professionals for health concerns.
How much does Harlen cost and how do I get access?
Harlen is in private beta, and access starts with a short founder-led demo. Pricing is shared on that call once we understand your roster. You can book a demo from any page on this site.
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