Mainstay Beta Program Agreement

Version 1.2 · August 27, 2026

This is the agreement every external beta tester accepts before receiving a TestFlight invite. The Terms of Service and Privacy Policy apply in full; this document adds the beta-specific parts and is written to be actually read.

What you're signing up for

Mainstay is a pre-release AI fitness coaching app for iPhone and Apple Watch. For two weeks, we ask you to:

• Complete at least two workouts per week using the app.
• Fill out a five-minute feedback survey at the end of each week.
• Tell us quickly if anything feels unsafe, wrong, or broken.

Beta access is free. It is not a promise of free access after launch or of any particular launch price.

Who can participate

By accepting, you confirm all of the following:

1. You are 18 or older.
2. You already train. You currently do resistance training and are comfortable in a gym without supervision.
3. You have no active injury and are not in rehabilitation. If you get injured during the beta, stop using the app for affected movements and tell us.
4. You are not pregnant, and you have no heart condition, uncontrolled blood pressure, or other medical condition that makes unsupervised exercise inadvisable. If you are unsure, ask your doctor first and skip the beta until cleared.

We limit the beta this way because the app cannot see you, cannot evaluate your form, and is not a medical device. It is a coaching tool for healthy adults who already lift.

The safety rules

• The AI can be wrong. Plans, weights, and cues are AI-generated and may contain errors. If a suggestion seems wrong for your body, skip or swap it. The app makes that easy; use it.
• Stop if something hurts. Pain, dizziness, chest discomfort, or shortness of breath means stop immediately. Seek medical attention if needed. No test workout matters more than that.
• Use weights you can control. The app suggests loads from your history and what you report. Only you can feel what your body is telling you.
• You assume the risk of exercise. Training carries inherent risk of injury. By participating you voluntarily accept that risk, as described in the Terms of Service.

Beta software reality

• Builds may crash, lose data, sync incorrectly between iPhone and Watch, or change without notice. Please report it when they do; that is the point of the beta.
• Do not rely on a beta build as the only record of training you care about. Workouts also save to Apple Health, which is your durable copy.
• We may add or remove testers, ship updates at any time, or end the beta program at our discretion.

Your data during the beta

• The Privacy Policy applies in full. In short: your data coaches you, is never sold, and is never used for advertising. Outdoor cardio GPS routes stay on your device in Apple Health; our servers get summary numbers only.
• During the beta, the founder reads your data personally. That means your coach conversations, the workouts the AI generated for you, what you actually trained, and the feedback you left — reviewed by hand to judge whether the coaching is any good and to fix it where it is not. This is the whole point of a beta this small: at this size, reading beats measuring. It is founder review of your account, not an anonymous aggregate.
• TestFlight sends us the feedback and crash logs you choose to share, under Apple's TestFlight terms.
• We use PostHog to see how the app is actually used. During the beta that means three things: usage events, screen recordings of your sessions (every text field and image masked on your device before the recording is sent, so your injury notes and coach messages are not in the video), and the prompts and responses behind your generated workouts and coach conversations. That last one does include the text of your coach chats. Details in the Privacy Policy, Section 7.
• You can delete your account and all server data anytime in the app (Profile > Delete Account). Deleting removes your data from our systems and asks our processors — PostHog included — to delete theirs.

Feedback and quotes

• Feedback you give us may be used to improve the product, without compensation.
• We will only quote you publicly (for example in App Store marketing) if you separately say yes to that in the survey, and only by first name.

The founding tester offer

Testers who complete the two-week beta will be offered a founding price of $149.99 for their first year (public price $199.99/year; renews at the then-current public annual price), redeemable by personal offer code when subscriptions launch. This offer is a thank-you, not an obligation to buy.

Acceptance

The application form must include this checkbox, unmodified:

☐ I am 18 or older, currently strength train, have no active injury or rehabilitation need, am not pregnant, and have no medical condition that makes unsupervised exercise inadvisable. I understand Mainstay is pre-release AI software that may contain errors, I accept the inherent risks of exercise, and I agree to the Mainstay Terms of Service, Privacy Policy, and Beta Program Agreement (linked above the form).