K&L·FIT

Terms of Use — K&L Fit

This is a translation provided for convenience. The Portuguese version prevails in case of any divergence, and Brazilian law applies.

Last updated: October 29, 2026 Version: 1.6. What's new in this version: trainers outside Brazil provide their country's professional registration instead of the CREF (1.6, sections 4.1 and 4.6); for now, the VIP plan only accepts cards issued in Brazil (1.5, section 8.1); Trainer Portfolio and "Find a trainer" (1.4, sections 4.6 and 5.5); Friends, Timeline and Body log, with the content rules (1.3, section 7A); VIP plan payments are now processed by Stripe, and the CPF of the person responsible now appears in these Terms (1.2); the app is now called K&L Fit, operated by K&L Fitness (Kalita & Lucas), with a new contact e-mail (1.1).

1. Who we are

K&L Fit is a digital platform operated by K&L Fitness (Kalita & Lucas), a brand maintained by Lucas Ferreira do Carmo Souza, an individual registered in the CPF (Cadastro de Pessoas Físicas, Brazil's individual taxpayer registry) under no. 058.853.921-02, based in Goiânia/GO ("K&L Fit", "we").

Contact: contact.klfitness@gmail.com.

By creating an account or using K&L Fit, you declare that you have read and agree to these Terms of Use, the Privacy Policy and the Cancellation and Refund Policy. If you do not agree, do not use the platform.

2. What K&L Fit is

K&L Fit is a tool for organizing and tracking workouts. It allows:

  • Trainers (Physical Education professionals) to register clients, build weekly workouts, track attendance and weight progress, and talk to their clients by chat (text and audio);
  • Clients to receive and do the workouts prescribed by their trainer, log weights and attendance, and talk to their trainer;
  • Regular users to build and do their own workouts, free of charge.

K&L Fit does not provide Physical Education services, does not prescribe workouts and does not offer medical advice. Prescription is the sole responsibility of the trainer who prepares it or, in the case of a regular user, of the user themselves.

3. Sign-up and account

3.1. To use K&L Fit, you must create an account providing your full name, e-mail, sex, date of birth, mobile phone number and a password, and accept these Terms. The information provided must be true, complete and up to date.

3.2. Minimum age:

  • Trainer: you must be at least 18 years old. A Trainer account involves purchasing paid plans, which requires full legal capacity (Brazilian Civil Code — Código Civil, art. 5º), and practicing the profession, which requires registration with the CREF.
  • Client/User: you must be at least 16 years old. Anyone aged 16 or 17 declares, when signing up, that their father, mother or legal guardian is aware of and authorizes their use of the platform. Accounts for people under 16 are not allowed.

3.3. Your date of birth is used to check the minimum age. If we identify an account that does not meet the minimum age or that provided false information, it may be suspended or deleted, and we may ask the account holder or their guardian for proof.

3.4. When signing up, you choose the account type, Trainer or Client/User, and the type cannot be changed later.

3.5. You are responsible for keeping your password confidential and for all activity carried out in your account. If you notice unauthorized use, let us know immediately at contact.klfitness@gmail.com.

3.6. Each person may have only one account of each type.

4. Specific rules for Trainers

4.1. By signing up as a Trainer, you declare that you are a Physical Education professional duly registered with the Regional Council of Physical Education (Conselho Regional de Educação Física — CREF), under Lei nº 9.696/1998. If you work outside Brazil, you declare that you hold the professional registration or certification required in your country (for example, NASM-CPT or REPs) and you provide that registration instead of the CREF. You also declare that you are solely technically responsible for the workouts you prescribe through the platform.

4.2. You are responsible for assessing each client's physical and health condition before prescribing workouts and for adapting the prescription to it.

4.3. You will only have access to a client's data after they accept your invite. Access is limited to what is necessary for tracking: workouts you prescribed, attendance, logged weights and chat messages. You undertake to:

  • use this data exclusively to provide your services to the client;
  • not share it with third parties;
  • handle it in accordance with Brazil's General Data Protection Law (Lei Geral de Proteção de Dados — Lei nº 13.709/2018, "LGPD").

4.4. The business relationship between you and your clients (fees, payments, schedules) is exclusively yours. K&L Fit does not take part in it, does not intermediate payments between trainer and client, and is not liable for it.

4.5. Trainer plans:

  • Free: allows tracking 1 (one) active client.
  • VIP: allows tracking 2 (two) or more clients, with no limit. It is available in the following cycles:
    • Monthly: R$ 29,99;
    • 6-month: R$ 161,95 (equivalent to R$ 26,99/month, 10% off);
    • Annual: R$ 287,90 (equivalent to R$ 23,99/month, 20% off).

The prices in effect are always those shown on the "My plan" page at the time of purchase.

4.6. Trainer Portfolio: a VIP Trainer who has provided their CREF (or professional registration, outside Brazil) may publish a profile (photo, introduction, specialties, city and type of service) on the "Find a trainer" page, visible to all K&L Fit Clients and Users. By publishing, you declare that the information is true and that your CREF registration (or your country's professional registration) is active. The search starts with trainers in the searcher's country; trainers who work online appear for any country. If you authorize it, your mobile number (WhatsApp) also appears on your profile. Clients and Users can start a conversation with you through the app's chat or through WhatsApp; you can block any conversation started through the portfolio. Your profile is removed from the portfolio when you deactivate it or when your VIP ends. Hiring, fees and the terms of the training service are agreed directly between you and the client; K&L Fit does not take part in that negotiation.

5. Specific rules for Clients and Users

5.1. Use as a Client or as a regular User is free.

5.2. You only become a trainer's client by accepting an invite from them. You can end this connection at any time from your Profile. Once it ends, the trainer no longer has access to your data from that point on.

5.3. Each client can have one trainer at a time.

5.4. Attendance: days with a scheduled workout on which the workout is not finished in the app are automatically recorded as missed. This record is for tracking only and does not result in any charge or penalty from K&L Fit.

5.5. Find a trainer: you can find trainers in the portfolio and talk to them through the app's chat or through WhatsApp (when the trainer authorizes it). The profile information is the responsibility of the trainer. You can end a conversation started through the portfolio at any time. Before hiring, check the professional's registration with the CREF of your region.

6. Health and safety (read carefully)

6.1. Physical exercise involves risks. Before starting any workout program, consult a doctor.

6.2. The exercise demonstration videos come from third-party platforms (YouTube) and serve only as a visual reference. They do not replace in-person guidance from a qualified professional.

6.3. Stop exercising immediately if you feel pain, dizziness, shortness of breath or any discomfort, and seek medical care.

6.4. Regular users who build their own workouts take responsibility for their choice of exercises, weights and volume.

7. Chat

7.1. Chat (text and audio) is available only between a trainer and their connected clients.

7.2. It is forbidden to send through the chat any content that is illegal, offensive, discriminatory, sexual, harassing, threatening, spam, or that violates the rights of third parties.

7.3. Messages are private between the parties. K&L Fit does not read chat content. It may only be accessed in the event of a report, court order or legal obligation, as set out in the Privacy Policy.

7A. Friends, Timeline and Body log

7A.1. Clients and Users can add friends (by invite link, e-mail or search by name) and post on the Timeline text, photos and summaries of their own workouts. Each post is Private (only the author sees it) or Friends (all your friends see, like and comment on it). You can unfriend someone, delete your posts and comments, and delete comments made on your posts at any time.

7A.2. Content rules. It is forbidden to post or comment: nudity or sexual content; illegal, offensive, discriminatory, harassing, threatening or spam content; photos of other people without their permission; personal data of third parties; and any content that violates the rights of third parties. You are responsible for what you post and declare that you hold the rights to the photos you upload.

7A.3. Reports and removal. Posts and comments can be reported in the app itself. We may remove content that violates these Terms and suspend or terminate the responsible account, as set out in section 11.

7A.4. Body log. The body photos kept in the Body log are visible only to you: they do not appear on the Timeline, to friends or to your trainer. You can delete them at any time.

8. Payments, renewal and cancellation

8.1. VIP plan payments are processed by Stripe Brasil Soluções de Pagamento – Instituição de Pagamento Ltda. (CNPJ 22.121.209/0001-46), which is also subject to its own terms. Card details are entered in Stripe's secure form and go directly to Stripe: K&L Fit does not receive or store the card number. For now, the VIP plan only accepts cards issued in Brazil: a card from a bank in another country is declined before any charge.

8.2. The VIP subscription renews automatically at the end of each cycle (monthly, 6-month or annual), charged to the same payment method, until you cancel it.

8.3. You can cancel at any time on the "My plan" page, without having to contact support. In short:

  • within 7 days of the first payment, the refund is full (right of withdrawal);
  • after that, there is no refund, but the VIP remains active until the end of the period already paid and is not renewed.

The details are in the Cancellation and Refund Policy.

8.4. Price changes: we may change plan prices with at least 30 days' prior notice by e-mail and in the app. The new price only applies from the first renewal after the notice, and you can cancel before then at no cost.

8.5. Non-payment: if the renewal charge is declined and payment is not settled within 2 (two) days after the due date, the account automatically switches to the Free plan (see section 8.6). Stripe may keep trying to charge. When payment is settled, the VIP and access for all clients are restored.

8.6. End of VIP: when the VIP ends, whether due to non-payment, withdrawal or the end of the paid period after cancellation, the account returns to the Free plan and all connected clients lose access to the trainer's workouts and to the chat. The trainer can then choose 1 (one) client to remain active, in line with the Free plan limit. Connections, workouts and history are not deleted and become available again when the VIP is reactivated. While they have no access, clients can keep using the "My workouts" mode normally.

8.7. Invites on the Free plan: the trainer can send as many invites as they want. The plan limit only counts active clients (accepted invites). If more than one client accepts invites on the Free plan, the trainer chooses which one stays active. The others remain connected, but without access, until the VIP is purchased.

9. Intellectual property

9.1. The K&L Fit brand, the software, the layout and the content produced by K&L Fit belong to Lucas Ferreira do Carmo Souza (K&L Fitness) and are protected by law.

9.2. Workouts created by a trainer belong to that trainer. The trainer grants us a limited license to store them and display them to their clients within the platform.

9.3. YouTube videos belong to their respective authors and are displayed through YouTube's official player.

10. Prohibited conduct

It is forbidden to:

  • use the platform for illegal purposes;
  • try to access other people's accounts or data;
  • reverse engineer, automatically collect data (scraping) or overload the systems;
  • resell access;
  • create fake accounts;
  • get around the Free plan limits.

11. Suspension and termination

11.1. We may suspend or terminate accounts that violate these Terms. Whenever possible, we will notify the account holder beforehand and give them an opportunity to respond, except in serious cases or under legal order.

11.2. You can delete your account at any time from your Profile. Your data will be handled as set out in the Privacy Policy.

12. Availability and liability

12.1. We make reasonable efforts to keep K&L Fit available and secure. Even so, interruptions may occur for maintenance or due to third-party failures (hosting providers, internet, Stripe, YouTube).

12.2. K&L Fit is not liable for:

  • workout prescriptions made by trainers or by users;
  • injuries resulting from doing exercises;
  • the business relationship between trainer and client;
  • third-party content.

Nothing in these Terms limits the rights guaranteed to you by Brazil's Consumer Protection Code (Código de Defesa do Consumidor).

13. Changes to these Terms

We may update these Terms. Relevant changes will be communicated at least 15 days in advance by e-mail and in the app. Continued use after the changes take effect means you agree to them. If you do not agree, you can cancel and delete your account.

14. Governing law and jurisdiction

These Terms are governed by the laws of Brazil. For consumers, the courts of the consumer's place of residence have jurisdiction. In all other cases, jurisdiction lies with the courts of the judicial district (comarca) of Goiânia/GO.

15. Contact

Questions about these Terms: contact.klfitness@gmail.com.