Terms of Service
Effective date: March 9, 2026
1. Agreement to Terms
These Terms of Service ("Terms") constitute a legally binding agreement between you ("you" or "User") and Grit ("Grit," "we," "us," or "our"), governing your access to and use of the Grit application, website at gritlegs.com, and all related services (collectively, the "Service").
By creating an account, accessing, or using the Service, you acknowledge that you have read, understood, and agree to be bound by these Terms. If you do not agree, you must not use the Service.
You must be at least 16 years of age to use the Service. By using the Service, you represent and warrant that you meet this age requirement.
2. Description of Service
Grit is an adaptive training application designed for ultra and trail running. The Service may include, but is not limited to:
- AI-generated coaching, training plans, and post-activity debriefs
- Syncing and analysis of activity data from third-party platforms (including Garmin, Strava, COROS, Suunto, Polar, and Wahoo)
- Collection, storage, and processing of health and fitness data such as GPS location, elevation, heart rate, cadence, and power metrics
- Mountain Legs Index (MLI) scoring and readiness assessment
- Multi-year race planning tools
We reserve the right to modify, suspend, or discontinue any part of the Service at any time, with or without notice.
3. Account Terms
To use certain features of the Service, you must create an account. When you do so, you agree to:
- Provide accurate, current, and complete information during registration
- Maintain and promptly update your account information to keep it accurate
- Maintain the security of your account credentials and not share them with any third party
- Accept responsibility for all activity that occurs under your account
- Notify us immediately if you suspect unauthorized access to your account
You may not create an account on behalf of another person or entity without their express permission. We reserve the right to suspend or terminate accounts that violate these Terms.
4. Acceptable Use
You agree not to:
- Use the Service for any unlawful purpose or in violation of any applicable law or regulation
- Attempt to gain unauthorized access to any part of the Service, other users' accounts, or any systems or networks connected to the Service
- Interfere with or disrupt the integrity or performance of the Service or its underlying infrastructure
- Reverse engineer, decompile, disassemble, or otherwise attempt to derive the source code of the Service
- Use automated means (bots, scrapers, or similar tools) to access the Service without our prior written consent
- Transmit any viruses, malware, or other harmful code through the Service
- Impersonate any person or entity, or misrepresent your affiliation with any person or entity
- Use the Service to harass, abuse, or harm another person
- Resell, redistribute, or commercially exploit the Service without our prior written consent
We reserve the right to investigate and take appropriate action against anyone who, in our sole discretion, violates this section, including removing content, suspending or terminating accounts, and reporting violations to law enforcement.
5. Intellectual Property
The Service and its original content (excluding content provided by users), features, and functionality are and will remain the exclusive property of Grit and its licensors. The Service is protected by copyright, trademark, and other intellectual property laws.
The Grit name, logo, Mountain Legs Index, MLI, and all related names, logos, product and service names, designs, and slogans are trademarks of Grit. You may not use such marks without our prior written permission.
You retain ownership of any data you submit to the Service, including activity data synced from third-party platforms. By using the Service, you grant Grit a non-exclusive, worldwide, royalty-free license to use, process, and analyze your data solely for the purpose of providing and improving the Service.
AI-generated content provided through the Service (including training plans, coaching recommendations, and debrief analyses) is provided for your personal, non-commercial use. You may not republish, resell, or redistribute such content without our prior written consent.
6. Third-Party Services and Integrations
The Service integrates with third-party platforms and services, including but not limited to Garmin, Strava, COROS, Suunto, Polar, and Wahoo (collectively, "Third-Party Services"). Your use of these integrations is subject to the following:
- Your relationship with each Third-Party Service is governed by that service's own terms of service and privacy policy, which you should review independently
- We are not responsible for the availability, accuracy, or reliability of data provided by Third-Party Services
- We are not liable for any loss or damage arising from your use of Third-Party Services or any changes they make to their platforms or APIs
- You authorize Grit to access and retrieve your data from Third-Party Services that you connect to your account
- You may revoke access to any Third-Party Service at any time through your account settings or through the Third-Party Service's own settings
Grit is not endorsed by, affiliated with, or sponsored by Garmin, Strava, COROS, Suunto, Polar, Wahoo, or any other third-party platform unless explicitly stated otherwise.
7. Health and Fitness Disclaimer
The Service is not a medical device and does not provide medical advice, diagnosis, or treatment.
All training plans, coaching recommendations, readiness scores, and other fitness-related content provided through the Service (whether generated by AI or otherwise) are for informational and educational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment from a qualified healthcare provider.
You acknowledge and agree that:
- You participate in all training activities, races, and physical exercise entirely at your own risk
- Ultra and trail running are inherently dangerous activities that carry risk of serious injury or death
- You should consult a qualified healthcare provider before beginning any new training program, particularly if you have any pre-existing health conditions
- AI-generated coaching and training recommendations may not account for all individual health factors, conditions, or circumstances
- Heart rate, power, cadence, and other biometric data displayed in the Service are derived from third-party devices and sensors, and may not be accurate
- You are solely responsible for determining whether any training activity is appropriate for your fitness level, health condition, and experience
If you experience any pain, discomfort, dizziness, or other symptoms during exercise, you should stop immediately and seek medical attention. Never disregard professional medical advice or delay seeking it because of information provided by the Service.
8. Disclaimer of Warranties
THE SERVICE IS PROVIDED ON AN "AS IS" AND "AS AVAILABLE" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT, OR COURSE OF PERFORMANCE.
Grit does not warrant that: (a) the Service will function uninterrupted, securely, or be available at any particular time or location; (b) any errors or defects will be corrected; (c) the Service is free of viruses or other harmful components; (d) the results of using the Service will meet your requirements; or (e) any data, including biometric and fitness data, will be accurate or reliable.
Some jurisdictions do not allow the exclusion of certain warranties. In such jurisdictions, the above exclusions may not apply to you, and you may have additional rights.
9. Limitation of Liability
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT SHALL GRIT, ITS OFFICERS, DIRECTORS, EMPLOYEES, AGENTS, SUPPLIERS, OR LICENSORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, INCLUDING WITHOUT LIMITATION LOSS OF PROFITS, DATA, USE, GOODWILL, OR OTHER INTANGIBLE LOSSES, RESULTING FROM:
- Your access to or use of (or inability to access or use) the Service
- Any conduct or content of any third party on the Service
- Any content obtained from the Service, including AI-generated training plans, coaching advice, and fitness recommendations
- Unauthorized access, use, or alteration of your transmissions or content
- Personal injury or property damage resulting from your use of the Service or reliance on any information provided through it
- Any interruption, loss, or corruption of data, including fitness and health data
IN NO EVENT SHALL GRIT'S TOTAL AGGREGATE LIABILITY TO YOU FOR ALL CLAIMS ARISING OUT OF OR RELATING TO THE USE OF THE SERVICE EXCEED THE AMOUNT YOU HAVE PAID TO GRIT IN THE TWELVE (12) MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM, OR ONE HUNDRED U.S. DOLLARS ($100), WHICHEVER IS GREATER.
Some jurisdictions do not allow the exclusion or limitation of liability for consequential or incidental damages. In such jurisdictions, the above limitations may not apply to you.
10. Indemnification
You agree to defend, indemnify, and hold harmless Grit and its officers, directors, employees, agents, and licensors from and against any claims, liabilities, damages, judgments, awards, losses, costs, expenses, or fees (including reasonable attorneys' fees) arising out of or relating to: (a) your violation of these Terms; (b) your use of the Service; (c) your violation of any rights of a third party; or (d) any content you submit to or through the Service.
11. Privacy and Data
Your privacy is important to us. Our collection, use, and sharing of your personal information, including health and fitness data, is governed by our Privacy Policy, which is incorporated into these Terms by reference.
By using the Service, you consent to the collection and processing of your data as described in the Privacy Policy. This includes, but is not limited to:
- Activity and workout data (GPS tracks, elevation profiles, pace, distance, duration)
- Biometric and physiological data (heart rate, cadence, power, and similar metrics)
- Data synced from connected Third-Party Services
- Information you provide directly, such as race goals, training preferences, and profile information
You may request deletion of your account and associated data at any time by contacting us. Upon account deletion, we will remove your personal data in accordance with our Privacy Policy and applicable law, subject to any legal retention obligations.
12. Termination
You may terminate your account at any time by discontinuing use of the Service and requesting account deletion.
We may terminate or suspend your account and access to the Service immediately, without prior notice or liability, for any reason, including but not limited to a breach of these Terms.
Upon termination: (a) your right to use the Service will immediately cease; (b) we may delete your account and all associated data, subject to our Privacy Policy and any legal retention obligations; and (c) all provisions of these Terms that by their nature should survive termination shall survive, including but not limited to intellectual property provisions, warranty disclaimers, indemnification, and limitations of liability.
13. Modifications to Terms
We reserve the right to modify or replace these Terms at any time at our sole discretion. If we make material changes, we will provide notice through the Service or by other reasonable means (such as email) at least thirty (30) days before the changes take effect.
Your continued use of the Service after any changes to these Terms constitutes your acceptance of the revised Terms. If you do not agree to the new Terms, you must stop using the Service. We encourage you to review these Terms periodically.
14. Governing Law and Dispute Resolution
These Terms shall be governed by and construed in accordance with the laws of the State of Delaware, 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 informal negotiation. If the dispute is not resolved within thirty (30) days of written notice, either party may pursue resolution through binding arbitration administered in accordance with the rules of the American Arbitration Association.
You agree that any arbitration or legal proceeding shall be conducted on an individual basis and not as a class action, class arbitration, or any other representative proceeding. You waive any right to participate in a class action lawsuit or class-wide arbitration against Grit.
15. General Provisions
Entire Agreement. These Terms, together with the Privacy Policy, constitute the entire agreement between you and Grit regarding the Service and supersede all prior agreements and understandings.
Severability. If any provision of these Terms is found to be unenforceable or invalid, that provision shall be limited or eliminated to the minimum extent necessary, and the remaining provisions shall remain in full force and effect.
Waiver. The failure of Grit to enforce any right or provision of these Terms shall not be deemed a waiver of such right or provision.
Assignment. You may not assign or transfer these Terms or your rights under them without our prior written consent. We may assign our rights and obligations under these Terms without restriction.
Force Majeure. Grit shall not be liable for any failure or delay in performing its obligations under these Terms due to circumstances beyond its reasonable control, including but not limited to natural disasters, acts of government, internet or infrastructure failures, or pandemics.
16. Contact
If you have any questions about these Terms of Service, please contact us at:
Grit
Email: support@gritlegs.com
Website: gritlegs.com