Terms of Service

Effective Date: February 27, 2026

Welcome to Critical HIIT! These Terms of Service ("Terms") govern your access to and use of the Critical HIIT mobile application and related services (collectively, the "Service"). Please read these Terms carefully before using the Service.

By creating an account, downloading, or using the Service, you agree to be bound by these Terms. If you do not agree to these Terms, do not use the Service. These Terms constitute a legally binding agreement between you and Critical HIIT ("we," "us," or "our").

1. Eligibility

You must be at least 13 years of age to use the Service. If you are between the ages of 13 and 18, you represent that your parent or legal guardian has reviewed and agreed to these Terms on your behalf. By using the Service, you represent and warrant that you meet these eligibility requirements.

2. Account Registration

To use the Service, you must create an account using one of the following methods: Sign in with Apple, Sign in with Google, or email and password registration. You are responsible for maintaining the security of your account credentials and for all activities that occur under your account. You agree to notify us immediately of any unauthorized use of your account.

We reserve the right to suspend or terminate your account at our discretion if we believe you have violated these Terms or engaged in conduct that is harmful to other users, us, or third parties.

3. Description of the Service

Critical HIIT is a fitness application that combines high-intensity interval training (HIIT) workouts with AI-generated fantasy storytelling. The Service uses artificial intelligence to generate unique narrative experiences that accompany your workouts. The Service is available as a mobile app for iOS and Android.

While our workouts are designed by certified fitness professionals, the storytelling component is generated by artificial intelligence. AI-generated stories are fictional and created for entertainment purposes only. Story content, characters, and narratives are procedurally generated and may vary in quality or coherence.

4. Subscriptions and Payments

4.1 Subscription Plans. Critical HIIT offers subscription-based access to premium features. Subscription options and pricing are displayed within the app at the time of purchase. We reserve the right to change subscription pricing at any time, though changes will not affect your current billing period.

4.2 Billing. Payment will be charged to your Apple ID or Google Play account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. Your account will be charged for renewal within 24 hours prior to the end of the current period.

4.3 Cancellation. You may cancel your subscription at any time through your device's account settings (App Store or Google Play). Cancellation takes effect at the end of the current billing period. You will retain access to premium features until the end of the period you have already paid for.

4.4 Free Trials. We may offer free trial periods for certain subscription plans. If you do not cancel before the trial ends, your subscription will automatically convert to a paid subscription at the applicable rate. Any unused portion of a free trial will be forfeited when you purchase a subscription.

4.5 Refunds. All purchases are processed through Apple's App Store or Google Play. Refund requests must be directed to Apple or Google, as applicable, in accordance with their refund policies. We do not process refunds directly.

5. Acceptable Use

You agree not to use the Service to:

Violate any applicable law, regulation, or these Terms
Attempt to reverse engineer, decompile, or disassemble the Service or any of its components
Use the Service in any way that could damage, disable, or impair the Service or interfere with other users' access
Attempt to gain unauthorized access to any part of the Service, other accounts, or computer systems or networks connected to the Service
Use automated scripts, bots, or other means to access or interact with the Service
Circumvent or attempt to circumvent any content protection, rate-limiting, or other technological measures in the Service
Use the Service to generate, distribute, or facilitate the distribution of harmful, abusive, or objectionable content
Resell, redistribute, or sublicense your access to the Service

6. AI-Generated Content

6.1 Nature of AI Content. The Service uses artificial intelligence (powered by third-party AI services) to generate story narratives that accompany your workouts. This content is generated algorithmically and may include fantasy themes, characters, scenarios, and dialogue.

6.2 No Guarantee of Quality. AI-generated content may occasionally produce text that is incoherent, repetitive, or unexpected. We strive to provide an enjoyable experience but do not guarantee the quality, accuracy, or appropriateness of AI-generated content at all times.

6.3 Content Ownership. AI-generated stories created through the Service are provided for your personal, non-commercial use. You may not reproduce, publish, distribute, or commercially exploit AI-generated content from the Service without our prior written consent.

6.4 Content Moderation. We make reasonable efforts to ensure AI-generated content is appropriate for users aged 13 and older. However, due to the nature of AI generation, we cannot guarantee that all content will meet every individual's expectations. If you encounter content you find objectionable, please contact us at contact@criticalhiit.fit.

7. Health and Fitness Disclaimer

IMPORTANT: The Service provides HIIT workouts for general fitness purposes. The Service is not a medical device, does not provide medical advice, and is not a substitute for professional medical guidance.

You should consult your physician or other qualified healthcare provider before starting any exercise program, particularly if you have any pre-existing health conditions, injuries, or concerns. You assume all risk associated with using the workouts provided through the Service.

By using the Service, you represent that you are physically able to participate in high-intensity interval training and that you have not been advised against exercise by a medical professional. If you experience pain, dizziness, shortness of breath, or any other concerning symptoms during a workout, stop exercising immediately and seek medical attention.

8. Intellectual Property

The Service, including but not limited to its design, code, graphics, workout content, user interface, and branding, is owned by Critical HIIT and is protected by copyright, trademark, and other intellectual property laws. These Terms do not grant you any right, title, or interest in the Service except for the limited right to use it in accordance with these Terms.

The Critical HIIT name, logo, and related marks are trademarks of Critical HIIT. You may not use these marks without our prior written permission.

9. Privacy

Your use of the Service is also governed by our Privacy Policy, which describes how we collect, use, and share your information. By using the Service, you consent to the practices described in the Privacy Policy. Our Privacy Policy is available within the app and on our website.

10. Third-Party Services

The Service relies on third-party services to operate, including but not limited to Apple and Google for authentication, OpenAI for AI content generation, RevenueCat for subscription management, and Firebase for analytics. Your use of these third-party services is subject to their respective terms and privacy policies.

We are not responsible for the availability, accuracy, or content of third-party services. Disruptions or changes to third-party services may temporarily affect the functionality of the Service.

11. Disclaimers and Limitation of Liability

11.1 Disclaimers. THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE SERVICE WILL BE UNINTERRUPTED, ERROR-FREE, OR SECURE.

11.2 Limitation of Liability. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, CRITICAL HIIT SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS OR REVENUES, WHETHER INCURRED DIRECTLY OR INDIRECTLY, OR ANY LOSS OF DATA, USE, GOODWILL, OR OTHER INTANGIBLE LOSSES, RESULTING FROM (A) YOUR USE OF OR INABILITY TO USE THE SERVICE; (B) ANY AI-GENERATED CONTENT; (C) ANY INJURY OR HARM RESULTING FROM WORKOUTS PERFORMED USING THE SERVICE; OR (D) ANY UNAUTHORIZED ACCESS TO OR USE OF OUR SERVERS OR YOUR PERSONAL INFORMATION.

11.3 Cap on Liability. TO THE MAXIMUM EXTENT PERMITTED BY LAW, OUR TOTAL LIABILITY TO YOU FOR ALL CLAIMS ARISING OUT OF OR RELATED TO THESE TERMS OR THE SERVICE SHALL NOT EXCEED THE AMOUNT YOU PAID TO US IN THE TWELVE (12) MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM, OR ONE HUNDRED U.S. DOLLARS ($100), WHICHEVER IS GREATER.

12. Indemnification

You agree to indemnify, defend, and hold harmless Critical HIIT, its officers, directors, employees, and agents from and against any claims, liabilities, damages, losses, and expenses (including reasonable attorneys' fees) arising out of or in connection with: (a) your use of the Service; (b) your violation of these Terms; (c) your violation of any applicable law or the rights of any third party; or (d) any injury or harm you sustain while performing workouts using the Service.

13. Termination

We may suspend or terminate your access to the Service at any time, with or without cause, and with or without notice. Upon termination, your right to use the Service will immediately cease. Provisions of these Terms that by their nature should survive termination will survive, including but not limited to ownership provisions, warranty disclaimers, indemnification, and limitations of liability.

You may terminate your account at any time by contacting us at contact@criticalhiit.fit. Upon account deletion, we will remove your personal data in accordance with our Privacy Policy.

14. Changes to These Terms

We may update these Terms from time to time. When we make material changes, we will notify you through the Service or by other reasonable means. Your continued use of the Service after the effective date of any changes constitutes your acceptance of the updated Terms. If you do not agree to the updated Terms, you must stop using the Service.

15. Governing Law and Dispute Resolution

These Terms shall be governed by and construed in accordance with the laws of the State of California, United States, without regard to its conflict of law provisions.

Any dispute arising out of or relating to these Terms or the Service shall first be attempted to be resolved through good-faith negotiation. If the dispute cannot be resolved through negotiation within thirty (30) days, either party may pursue resolution through the courts located in the State of California.

16. General Provisions

Entire Agreement. These Terms, together with our Privacy Policy, constitute the entire agreement between you and us regarding the Service.

Severability. If any provision of these Terms is found to be unenforceable, the remaining provisions will remain in full force and effect.

Waiver. Our failure to enforce any right or provision of these Terms shall not constitute a waiver of that right or provision.

Assignment. You may not assign or transfer these Terms or your rights under these Terms without our prior written consent. We may assign these Terms without restriction.

17. Apple-Specific Terms

If you access the Service through an Apple device, the following additional terms apply:

These Terms are between you and Critical HIIT only, and not with Apple. Critical HIIT is solely responsible for the Service and its content.
Apple has no obligation to provide maintenance or support services for the Service.
In the event of any failure of the Service to conform to applicable warranties, you may notify Apple and Apple will refund the purchase price (if any) for the app. Apple has no other warranty obligation with respect to the Service.
Critical HIIT is responsible for addressing any claims relating to the Service, including product liability, legal compliance, and intellectual property claims.
Apple and its subsidiaries are third-party beneficiaries of these Terms. Upon your acceptance of these Terms, Apple will have the right to enforce these Terms against you as a third-party beneficiary.

18. Contact Us

If you have any questions about these Terms, please contact us at:

contact@criticalhiit.fit