Privacy Policy

Last updated: September 2026

Tensio LLC ("Tensio", "we", "us") builds a wearable device and companion mobile app for strength training. This policy explains what we collect, why, and what control you have over it. It covers both the Tensio website and the Tensio mobile app.

Information You Give Us

Account information. Email address and password when you create an account. Optionally a display name and profile photo.
Training information. Exercises, programs, sets, reps, weights, notes, and any other details you enter or edit in the app.
Marketing signups. Email address, and name if you provide one, when you join our mailing list.

Information Collected by the Tensio Bands

The Tensio bands contain motion sensors (accelerometer and gyroscope). While you train, they record motion data and send it to the app over Bluetooth. The app processes this into measurements such as repetitions, timing, tempo, time under tension, and left/right differences.

Motion and workout data is stored on your device and, when you are signed in, synced to our servers so it is available across devices and is not lost if you lose your phone. We use this data to operate the product, to improve our measurement algorithms, and to develop future coaching features. When used for algorithm and product development, data is handled in aggregated or de-identified form.

The bands do not record audio, images, or location.

Apple Health (HealthKit)

If you choose to connect Apple Health, Tensio reads data you explicitly authorize, which may include sleep, recovery, activity, and nutrition information. We use it only to show you how these factors relate to your training within the app.

Specifically:

We read from Apple Health. We never write data to Apple Health.
We never use Apple Health data for advertising, marketing, or any similar purpose.
We never sell Apple Health data, and we never share it with third parties for their own purposes, including data brokers.
Connecting Apple Health is entirely optional. You can revoke access at any time in the iOS Health app under Sharing, and the rest of Tensio will continue to work.

Bodyweight, sleep, recovery and similar daily logs you enter in the app are health data too. They are stored to show you, and to show your coach if you choose to share them. They are not included in the research copy described below unless a future update says so and gives you the choice.

Information Collected Automatically

We collect basic technical information needed to run and support the product, such as app version, device model, operating system version, and error and crash diagnostics.

We also use product analytics to understand which features are used and where the app is not working well. This is limited to usage and device information. We do not include Apple Health data in analytics.

How We Use Your Information

To provide the app: recording sets, programs, and history
To sync your data across your devices and back it up
To improve measurement accuracy and develop new features
To respond to support requests
To send product updates, if you have opted in

We do not sell your personal information.

Coaching

If you coach on Tensio, or are coached by someone on Tensio, we store the coaching relationship, the programs and workouts the coach writes for you, the adjustments they make and the reasons they give, the messages between you, weekly check-ins, and anything you choose to share with your coach, such as daily logs, notes, facts and progress photos. Your coach sees your sets and sessions, and sees the rest only if you turn on sharing for them.

You can end coaching at any time. You keep your own training history and a copy of your program. Coaches own the programs they write, and we never show one coach’s programs to another coach.

How We Train Our Models

Tensio builds measurement and coaching models from training data. Those models are never trained against the live tables that hold your account. We maintain a separate, de-identified research copy, rebuilt nightly, and that copy is the only thing our models see.

The research copy contains workouts, sets and their motion-derived measurements, the structure of coaching assignments, and the adjustments a coach made together with the reason they gave. Where a check-in is included it is the numbers only.

It never contains names, email addresses, usernames, profile or progress photos, the text of messages between a coach and a client, written check-in answers, coach notes, Apple Health or daily log entries, or conversations with the in-app assistant. Every identifier is replaced with a salted one-way hash, so a row in the research copy cannot be traced back to the account it came from.

You can opt out at any time. In the app, open Menu, then Account, and turn off “Help improve Tensio’s coaching”. Your data is excluded from the next nightly rebuild, and the rest of Tensio works exactly as before.
Under 18s are excluded from the research copy entirely.
Deleting your account removes it. Deletion purges your rows from the research copy immediately, not at the next rebuild.

Conversations with Tensio

What you say to Tensio in the app, and what it says back, is stored with your account so it can remember your training between sessions and so we can improve how it understands people. This is on by default. You can turn it off at any time in the app under Menu, then Cloud sync, under “Conversations with Tensio”. Conversations already stored are removed when you delete the conversation in the app or delete your account. Conversations are never shared with your coach.

Service Providers

We use third-party providers to operate Tensio, including cloud hosting and database services for account and workout data, product analytics and crash reporting, and an email platform for our mailing list. These providers may process your information only to perform services on our behalf, and are not permitted to use it for their own purposes.

Data Retention

We keep your account and training data for as long as your account is active. If you ask us to delete your account, we remove your personal data from our production systems, and from backups on their normal rotation. Your rows in the de-identified research copy described above are purged at the same time. Aggregate figures that never referred to an individual, such as overall model accuracy, are not affected.

Your Choices and Rights

Deletion. You can delete your account from the app under Menu. Deletion removes your account and all data tied to it, including your rows in the research copy. You can also email us to request it.
Access. Email us to request a copy of your data.
Apple Health. Revoke access at any time in the iOS Health app.
Bluetooth. Revoke access in iOS Settings. The bands will no longer connect.
Email. Unsubscribe using the link in any message.

Depending on where you live, you may have additional rights over your personal data, including the right to access, correct, delete, or object to certain processing. Contact us and we will honor them.

Data Security

Data is transmitted over encrypted connections and stored with access controls that restrict each account to its own data. No method of transmission or storage is completely secure, but we take reasonable measures to protect your information.

Children

You must be 18 or older to create a Tensio account. We do not knowingly collect information from anyone under that age, and accounts known to belong to under 18s are excluded from the research copy regardless. If you believe a minor has provided us information, contact us and we will delete it.

Beta Testing

If you are using a pre-release or beta version of Tensio, features may change and data recorded during testing may be reset as the product develops. We will tell you before anything is deleted where we reasonably can.

Changes to This Policy

We will update this page when our practices change and revise the date above. Significant changes will be communicated in the app or by email.

Contact Us

Tensio LLC, Cincinnati, Ohio, USA
Email: jimmy@tensio.io