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Client Terms of Service

Last updated: 7 August 2026
Document version: 2026-08-07

1. Introduction and Acceptance

These Client Terms of Service ("Agreement") govern your access to and use of the LostFit mobile application ("Client App") and related services provided by LSTT Solutions Oy ("LostFit", "we", "us", "our") as an end user or client of a fitness trainer or coach ("you", "your").

By downloading, installing, or using the Client App, or by accepting this Agreement when prompted during onboarding, you agree to be bound by its terms. If you do not agree, you must not use the Client App.

2. Definitions

In this Agreement, the following terms have the meanings set out below:

  • "Client App" means the LostFit mobile application made available to you to access training programmes, track progress, communicate with your Trainer, and use other features.
  • "Services" means the Client App and any related functionality made available to you by LostFit.
  • "Trainer" means the personal trainer, coach, gym, or fitness professional who has invited you to use the Services.
  • "Trainer App" means the separate application used by your Trainer to manage their coaching business and Clients.
  • "Content" means any data, text, images, measurements, photos, or other material you upload or enter into the Client App.

3. Your Relationship with Your Trainer

3.1 Trainer Is Your Service Provider

Your training and coaching services are provided by your Trainer, not by LostFit. LostFit provides the technology platform that enables you and your Trainer to interact, but LostFit is not a party to any agreement between you and your Trainer and has no control over the training, coaching, nutrition, or other services your Trainer provides.

3.2 Payments to Your Trainer

If your Trainer charges fees for their services, your payment obligation is to your Trainer. Any disputes about fees, refunds, or the quality of coaching services should be directed to your Trainer.

3.3 Contact Your Trainer First

For questions about your training programme, exercise plans, nutrition advice, or any other coaching content, please contact your Trainer directly through the Services or using the contact details your Trainer has provided.

4. Account Registration and Eligibility

4.1 How You Get Access

You access the Client App through an invitation from your Trainer. You will be asked to create an account by providing basic registration information (such as name and email address).

4.2 Accuracy of Information

You agree to provide accurate, current, and complete information when registering and to keep your account information up to date. You are responsible for maintaining the confidentiality of your login credentials and for all activity that occurs under your account.

4.3 Age

You must be at least 16 years of age to use the Services. If you are under 16, you may not create an account or use the Client App.

5. Use of the Client App

5.1 What You Can Do

Through the Client App, you may (subject to what your Trainer has enabled):

  • view and follow training programmes and workout plans created by your Trainer;
  • log workouts, sets, repetitions, body measurements, weight, and other progress data;
  • communicate with your Trainer via the in-app messaging features;
  • track your progress over time; and
  • view nutrition or meal-related guidance provided by your Trainer.

5.2 Acceptable Use

You agree that you will not:

  • use the Client App for any unlawful purpose;
  • upload Content that is defamatory, offensive, harmful, or infringing of any third party's rights;
  • attempt to access any other user's account or data;
  • reverse engineer, decompile, or attempt to extract the source code of the Client App;
  • use any automated tool, bot, or script to access the Client App; or
  • interfere with or disrupt the Services or their underlying infrastructure.

5.3 Messaging with Your Trainer

The Client App includes messaging between you and your Trainer. LostFit does not monitor, read, or moderate those messages in the ordinary course of providing the Services, and gives no undertaking to do so.

If you experience abuse, harassment, or anything that makes you feel unsafe, you can report it to us at support@lsttsolutions.fi. We may access the messages concerned in order to investigate a report, and we may suspend or terminate an account under Section 11.3 where we consider it necessary. We may also access messages where we are required to by law or where it is necessary to maintain the security of the Services. Our Privacy Policy explains how we handle personal data in those situations.

Reporting something to us does not replace contacting the police or other authorities where you believe a criminal offence has occurred, and LostFit is not able to act as an intermediary in a dispute between you and your Trainer.

6. Health, Safety, and Medical Disclaimer

6.1 Consult a Doctor

Physical exercise carries inherent risks. Before beginning any training programme available through the Client App, you should consult a qualified medical professional, particularly if you have any existing health condition, injury, disability, or if you are pregnant or have recently given birth.

6.2 No Medical Advice

Nothing in the Services or any Content provided by your Trainer through the Services constitutes medical advice, diagnosis, or treatment. Training programmes, exercise suggestions, and nutrition guidance are not intended as a substitute for professional medical advice.

6.3 Your Responsibility

You exercise at your own risk. You are responsible for assessing whether any exercise, programme, or activity is appropriate for your individual health status and fitness level. If you experience pain, dizziness, shortness of breath, or any adverse physical reaction during exercise, stop immediately and seek medical attention if necessary.

6.4 AI-Assisted Content

LostFit is building features that use artificial intelligence to help Trainers prepare training programmes, nutrition and meal guidance, and progress summaries. These features are not yet available, and no data about you is currently sent to any AI service.

When they become available, content generated with AI assistance will be labelled as AI-assisted in the App, in accordance with Article 50 of Regulation (EU) 2024/1689 (the EU AI Act).

AI-assisted content is a starting point for your Trainer, not a decision made about you. Your Trainer reviews it and decides what to give you as part of their professional service — no AI-generated content reaches your programme without your Trainer's review. AI-assisted content is not medical or nutritional advice and the disclaimers in Sections 6.1 to 6.3 apply to it in full.

Nutrition and meal content. AI-generated meal and nutrition suggestions are produced from the information recorded in the Services. They do not take account of any allergy, intolerance, medication, medical condition, pregnancy, or dietary requirement that has not been recorded, and even where such information has been recorded the suggestion may not reflect it correctly. Tell your Trainer about any allergy, intolerance, medical condition, or medication before following any meal or nutrition guidance, and speak to a healthcare professional if you are unsure whether it is suitable for you.

Where your Trainer uses these features once they launch, data about your training and progress — such as measurements, weight history, goals, exercise progression, and any dietary preferences or restrictions recorded — is sent to an AI service provider with your name, email address, contact details, photographs, and free-text notes removed. The provider used, where it processes the data, and the safeguards that apply will be named in our Privacy Policy before the feature is switched on.

6.5 Before You Start

Talk to a healthcare professional, and to your Trainer, before you begin — particularly if you have an injury or medical condition, are pregnant or postpartum, are taking medication, or have or are recovering from a difficult relationship with food, exercise, or your body.

The Client App records weight, body measurements, progress photos, and calorie and nutrition targets. LostFit provides the technology only and cannot assess whether tracking any of this is appropriate for you, or whether any programme or meal plan suits your circumstances. LostFit does not provide medical, nutritional, or coaching advice (Section 13.1). Those questions are for you, your Trainer, and your healthcare professional.

You can ask your Trainer to turn off or stop using any tracking feature you would rather not use.

7. Your Content

7.1 Ownership

You retain ownership of all Content you upload or enter into the Client App, including body measurements, progress photos, workout logs, and personal notes.

7.2 Licence to LostFit

By uploading Content to the Client App, you grant LostFit a limited, non-exclusive, worldwide, royalty-free licence to host, process, and display that Content solely to provide the Services to you and your Trainer.

LostFit will not use your Content for any other purpose, except that LostFit may:

  • process it as necessary to operate, secure, back up, and troubleshoot the Services;
  • produce statistics and insights in aggregated or anonymised form, from which you cannot be identified and which are never linked back to you; and
  • comply with a legal obligation or respond to a lawful request from a public authority.

LostFit does not sell your Content, does not use it for advertising or profiling, and does not use your personal data, health data, measurements, progress photos, or messages to train artificial intelligence models.

7.3 Trainer Access

Your Trainer has access to the Content you provide through the Services as part of delivering their coaching services to you. Please refer to your Trainer's own privacy policy or terms for information about how your Trainer handles your data.

7.4 Sensitive Information

The Services may allow you to record health-related data, including body measurements, weight, dietary information, and injury notes. Providing such data is voluntary. You should only provide health-related data that you are comfortable sharing with your Trainer and that is necessary for your training.

7.5 Progress Photos

If you choose to upload progress photos, the following applies:

  • Uploading them is entirely voluntary and no feature of the Client App requires it.
  • They are visible to you and to your Trainer. They are not visible to other clients, to other trainers, or to any other user of the Services.
  • LostFit does not use them in marketing or promotional material, does not use them to train artificial intelligence models, and does not disclose them to any third party except as needed to store and display them for you and your Trainer, or where required by law.
  • You can delete any individual photo at any time from within the Client App.
  • All progress photos are deleted when your account is deleted, and in accordance with the retention periods in our Privacy Policy.

LostFit staff do not view progress photos in the ordinary course. Access is limited to what is necessary to operate and secure the Services, to investigate a report under Section 5.3, or to comply with a legal obligation.

8. Data Protection and Privacy

8.1 LostFit's Role

When you use the Client App and your data is processed on behalf of your Trainer, your Trainer acts as the data controller for your personal data and LostFit acts as a data processor. For data that LostFit processes in its own right (such as your account and usage data), LostFit is the data controller.

8.2 Privacy Policy

LostFit's Privacy Policy, available at lostfit.fi/privacy, explains how we collect, use, and protect your personal data, and how you can exercise your rights under the GDPR.

8.3 Your Data Rights

You have the right to access, rectify, erase, restrict, and port your personal data, as well as to object to certain processing, in accordance with the GDPR. Requests regarding personal data processed by your Trainer should generally be directed to your Trainer. Requests about data processed by LostFit as controller may be sent to gdpr@lsttsolutions.fi.

9. Intellectual Property

LostFit owns all intellectual property rights in the Client App, including its design, features, software, and branding. You are granted a limited, personal, non-transferable, non-sublicensable, revocable licence to use the Client App for your personal use in connection with your training. You may not copy, modify, distribute, sell, or reverse engineer any part of the Client App.

Training programmes, templates, videos, and other materials created by your Trainer belong to your Trainer and are made available to you solely for your personal use as part of their coaching services. You may not reproduce, share, or commercialise any Trainer content without your Trainer's express permission.

All rights not expressly granted in this Agreement are reserved. No licence or right in any LostFit intellectual property is granted to you by implication, estoppel, or otherwise. © LSTT Solutions Oy. All rights reserved.

10. Availability and Changes

LostFit will use commercially reasonable efforts to make the Client App available. However, LostFit does not guarantee uninterrupted or error-free access. The Client App may be temporarily unavailable due to maintenance, updates, or circumstances outside LostFit's control. LostFit may update or modify the Client App at any time.

11. Termination and Account Deletion

11.1 By You

You may stop using the Client App at any time. To request deletion of your account, please contact support@lsttsolutions.fi or use the account deletion feature in the Client App, if available. Account deletion will result in the deletion of your personal data in accordance with LostFit's Privacy Policy.

11.2 By Your Trainer

Your Trainer may remove you from their account or close your client profile, which may affect your ability to access certain content and data within the Services.

11.3 By LostFit

LostFit may suspend or terminate your access to the Client App if you breach this Agreement, if your Trainer's account is terminated, or as required by law.

If your access is suspended or terminated because your Trainer's account is closed, LostFit will notify you by email within 7 days of the Trainer's account closure. You will have 30 days from the date of that notification to request a copy of your personal data. Send the request to the address in the Contact section and we will provide it in a structured, commonly used, machine-readable format within 30 days of the request, free of charge. After the 30-day window, your personal data will be deleted in accordance with our Privacy Policy and Retention Policy.

12. Disclaimer of Warranties

THE CLIENT APP IS PROVIDED "AS IS" AND "AS AVAILABLE". TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, LOSTFIT DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. LOSTFIT DOES NOT WARRANT THAT THE CLIENT APP WILL MEET YOUR REQUIREMENTS OR BE UNINTERRUPTED, TIMELY, SECURE, OR ERROR-FREE.

13. Limitation of Liability

13.1 Platform Intermediary Role

LostFit is a technology platform that enables you to access coaching services provided by independent Trainers. LostFit does not provide coaching, training advice, nutritional guidance, or medical advice.

13.2 Exclusion of Indirect Loss

To the maximum extent permitted by applicable mandatory consumer law, LostFit is not liable for any indirect, incidental, special, or consequential loss or damage arising from your use of the Client App — including loss of profits or business interruption.

To the same extent, and subject always to Section 13.3, LostFit is not liable for the loss, corruption, or unavailability of Content or data, whether that loss is direct or indirect. The Client App is not a backup or archival service; you may request a copy of your data at any time under Section 8.3.

13.3 Absolute Limits on Exclusion

Nothing in this Agreement limits or excludes LostFit's liability for: (a) death or personal injury caused by LostFit's negligence; (b) fraud or fraudulent misrepresentation by LostFit; (c) any other liability that cannot be excluded or limited under applicable mandatory consumer protection law, including the Finnish Consumer Protection Act (38/1978) and applicable EU consumer law directives; or (d) breaches of data protection law.

13.4 Trainer Liability

LostFit is not responsible for the actions, advice, programmes, or services of your Trainer. Claims relating to the quality or outcome of coaching services should be directed to your Trainer.

13.5 Third-Party Services

The Client App depends on services operated by third parties, including hosting, database, email, and notification providers. Subject to Section 13.3, LostFit is not responsible for interruptions, delays, or loss caused by the failure, outage, or discontinuation of such a provider.

13.6 Events Outside Our Control

Subject to Section 13.3, LostFit is not responsible for any delay or failure to provide the Client App caused by circumstances beyond its reasonable control — for example a failure of the cloud or database provider we rely on, a cyberattack, a failure of internet infrastructure, a natural disaster, a public health emergency, or government action. Where such an event occurs, our obligations are paused for as long as it lasts rather than breached, and we will resume as soon as we reasonably can.

This does not pause our data protection obligations. We remain responsible for the security of your personal data, for notifying personal data breaches, and for your rights under the GDPR, throughout any such event.

13.7 Your Consumer Rights

Nothing in this Agreement affects your statutory rights as a consumer. If you are a consumer in Finland or the EU, you retain all rights granted to you by mandatory consumer protection law regardless of any other terms of this Agreement.

14. Changes to This Agreement

LostFit may update this Agreement from time to time. We will notify you of material changes by email or via an in-app notice at least 30 days before the changes take effect.

If you do not accept the changes, you may stop using the Client App before the effective date without penalty. Continued use of the Client App after the effective date constitutes your acceptance of the updated Agreement.

15. Governing Law and Dispute Resolution

15.1 Governing Law

This Agreement is governed by and construed in accordance with the laws of Finland.

15.2 Consumer Dispute Resolution

If you are a consumer and have a dispute with LostFit that cannot be resolved through direct contact with us, you may refer the dispute to the Finnish Consumer Disputes Board (Kuluttajariitalautakunta) at https://www.kuluttajariita.fi. Before doing so, we recommend contacting the Finnish Consumer Advisory Service (Kuluttajaneuvonta, https://www.kkv.fi/en/consumer-advice/).

15.3 Jurisdiction

Any legal proceedings arising out of this Agreement will be subject to the jurisdiction of the competent Finnish courts.

16. Contact Information

If you have questions about this Agreement or need support, please contact us at:

LSTT Solutions Oy Business ID (Y-tunnus): 3585888-3 Registered address: Takkulantie 320, 21270 Nousiainen, Finland Website: https://lostfit.fi Email: legal@lsttsolutions.fi Support: support@lsttsolutions.fi GDPR enquiries: gdpr@lsttsolutions.fi