Last updated 2026-07-23.

Terms of Service

Last updated: 2026-07-23

These Terms of Service (“Terms”) are a binding agreement between you and MyThreshold (“MyThreshold”, “we”, “us”, “our”), an operator established in Bulgaria, European Union, providing the MyThreshold service (the “Service”). By creating an account, clicking to accept, or otherwise accessing or using the Service, you agree to these Terms. If you do not agree, do not use the Service.

PLEASE READ THESE TERMS CAREFULLY. THEY INCLUDE: A DISCLAIMER THAT THE SERVICE PROVIDES NO MEDICAL OR PROFESSIONAL ADVICE (SECTION 2); YOUR ASSUMPTION OF THE RISKS OF PHYSICAL TRAINING (SECTION 3); DISCLAIMERS OF WARRANTIES AND OF THE ACCURACY OF AI-GENERATED OUTPUT (SECTIONS 4, 5 AND 8); A LIMITATION OF LIABILITY (SECTION 9); YOUR AGREEMENT TO INDEMNIFY US (SECTION 10); AND, FOR UNITED STATES USERS, A BINDING INDIVIDUAL ARBITRATION AGREEMENT AND CLASS-ACTION WAIVER (SECTION 12), WITH AN OPT-OUT RIGHT.

1. What the Service does

MyThreshold syncs training data from your connected device or provider (e.g. Garmin), computes training-load and readiness metrics (e.g. CTL/ATL/TSB, TSS, Normalized Power) from published exercise-science formulas, and surfaces those computed numbers and AI-generated analysis in a chat interface. MyThreshold analyzes, computes, surfaces, flags, and suggests — it does not coach you, does not replace a coach, and does not make any decision on your behalf. Every output of the Service — a number, a chart, a chat reply, a suggested workout adjustment — is informational only. You alone decide whether to act on it, and you act on it at your own risk as described in Section 3.

2. No medical or professional advice

The Service is a data-analysis tool. It is not a medical device, not a diagnostic service, not a therapeutic service, and not a substitute for professional medical, physiotherapy, nutrition, or coaching advice. Using the Service does not create a doctor–patient relationship, a coach–athlete relationship, or any other professional-services or fiduciary relationship between you and MyThreshold or anyone associated with it. Nothing the Service surfaces — a readiness score, a training-load flag, a chat reply, an AI-generated observation or suggestion — is medical advice, and none of it is a substitute for the judgment of a licensed physician, physiotherapist, or certified coach who knows your actual medical history, injury history, and circumstances.

Always consult a qualified physician or other appropriate professional before beginning, changing, or continuing any training program, and in particular if you have or suspect any health condition, are taking medication, are returning from injury or illness, are pregnant, are over 40 and beginning intensive training, or if any number or statement the Service surfaces concerns you. Never disregard, delay, or discontinue professional medical advice because of something the Service surfaced. If you experience chest pain, dizziness, faintness, unusual shortness of breath, or any other concerning symptom during exercise, stop immediately and seek medical attention — regardless of anything the Service reports.

3. Assumption of risk

Physical training and exercise carry an inherent risk of injury, including serious injury, permanent disability, and death, regardless of what any analytics tool reports. Those risks include, without limitation, musculoskeletal injury, cardiovascular events, overtraining, dehydration, heat- and cold-related illness, and accidents occurring during training. By using the Service you acknowledge these risks, confirm that you are voluntarily choosing to train, and knowingly and voluntarily assume all risks arising from your training and from any decision you make in reliance on anything the Service surfaces, to the maximum extent permitted by the law that applies to you.

Any adjustment to your training that you make based on anything the Service surfaces (a metric, a flag, a suggestion, a chat reply) is entirely voluntary and at your own risk. You are solely responsible for evaluating whether any training load, intensity, or plan change is appropriate for your own body, health, fitness level, and circumstances, and for stopping if something feels wrong, regardless of what the Service reports. Nothing in this Section 3 excludes or limits any liability that cannot be excluded or limited under the law that applies to you (see Section 9.3), and nothing in it waives any right that a statute in your jurisdiction makes non-waivable.

4. No guarantee of accuracy of metrics and data

Every computed or estimated metric the Service produces is an approximation, derived from (a) published exercise-science and sports-medicine formulas, which are population-level models and may not fit your individual physiology, and (b) data supplied by your connected device or provider (e.g. Garmin), which is itself subject to sensor error, missing data, sync gaps, and third-party processing errors outside our control. Some values (e.g. an estimated FTP from a single test, a predicted race time) are explicitly labeled estimated — a further extrapolation one step removed from a direct measurement or computation — and are less reliable than a directly measured or computed value. Where the Service distinguishes “measured” vs. “computed” vs. “estimated”, that label tells you which category a given number falls into; always check it before relying on a number for a real-world decision. We do not warrant that any number, trend, or output the Service produces is accurate, complete, current, or fit for any particular purpose.

5. AI-generated output

The Service’s chat and coaching-assistant features generate output using artificial-intelligence models. You are informed, and you acknowledge, that when you use the chat feature you are interacting with an AI system, not a human being. AI-generated output is produced by statistical models and:

  • may be inaccurate, incomplete, outdated, or simply wrong, including in ways that are not obvious and that sound confident;
  • is not reviewed, verified, or approved by any human being — medical, coaching, or otherwise — before it is shown to you;
  • is informational only and is not advice of any kind (see Section 2);
  • must be independently verified by you before you rely on it for any decision affecting your health, training, safety, or anything else that matters to you.

We make no representation or warranty of any kind regarding AI-generated output, and, to the maximum extent permitted by applicable law, we accept no liability for your reliance on it.

6. Automated consistency check — what it is (and is not)

Certain higher-impact actions the Service’s coaching-assistant feature can propose (for example, a proposed schedule change or a write to stored coaching state) may, before being applied, be run through an automated second check by a separate AI model that assesses whether the proposal is internally consistent with the evidence supplied to it. This is an automated quality and consistency check only. It is not a safety certification, not a clinical or medical review, not a guarantee of correctness, and not performed or supervised by any licensed medical or coaching professional. An automated “approval” means only that the proposal appeared internally consistent with the data the system had at that moment; it does not mean the proposal is accurate, safe, or appropriate for you, and it carries no clinical or professional weight whatsoever. We do not warrant that this check will run on any particular action, catch any particular error, or operate in any particular way, and we may modify or discontinue it at any time. Everything in Sections 2 through 5 applies with full force to any output that has passed this check.

The Service processes biometric and training data that includes or is derived from your heart rate, heart-rate variability (HRV), and other physiological signals, in order to compute training load, readiness, and fitness metrics. We treat this data as data concerning health under applicable data-protection law, including Article 9 of the GDPR where the GDPR applies to you, and we process it on the basis of your explicit consent, which you give through a dedicated, unbundled checkbox at signup, separate from your acceptance of these Terms. The categories of data covered and everything else about how we handle your data are set out in our Privacy Policy, which is incorporated into these Terms by reference. You may withdraw that consent at any time as described in the Privacy Policy; withdrawing consent will limit or disable the features that depend on that data but does not affect the lawfulness of processing carried out before withdrawal.

8. Disclaimer of warranties

To the maximum extent permitted by applicable law, the Service is provided “AS IS” and “AS AVAILABLE”, with all faults and without warranty of any kind. We expressly disclaim all warranties and conditions, whether express, implied, statutory, or otherwise, including without limitation any implied warranties of merchantability, fitness for a particular purpose, accuracy, quiet enjoyment, and non-infringement, and any warranty arising out of course of dealing or usage of trade. We do not warrant that the Service will be uninterrupted, timely, secure, or error-free; that data syncs from third-party providers will be complete or accurate; that any defect will be corrected; or that any output of the Service (including any AI-generated output) is accurate or reliable.

If you are a consumer in the EU, UK, or EEA: nothing in this Section 8 affects any statutory guarantee, conformity right, or other consumer right that the mandatory law of your country of residence grants you and that cannot be excluded or limited by contract. Those rights are unaffected by these Terms.

9. Limitation of liability

9.1 Excluded damages. To the maximum extent permitted by applicable law, MyThreshold, its owner and operator, and its contractors, licensors, and suppliers (together, the “MyThreshold Parties”) will not be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, or for any loss of profits, revenue, data, goodwill, or anticipated savings, or for any personal injury, bodily harm, or loss of health arising out of or relating to your use of or inability to use the Service, your training decisions, or your reliance on any output of the Service, whether based on warranty, contract, tort (including negligence), statute, or any other legal theory, and even if a MyThreshold Party has been advised of the possibility of such damages.

9.2 Liability cap. To the maximum extent permitted by applicable law, the aggregate liability of the MyThreshold Parties for all claims arising out of or relating to the Service or these Terms will not exceed the greater of (a) the total amount you paid us for the Service in the twelve (12) months preceding the event giving rise to the claim, and (b) fifty US dollars (USD 50).

9.3 What this Section does not limit. Nothing in these Terms excludes or limits, or purports to exclude or limit, liability for:

  • our fraud or fraudulent misrepresentation;
  • our gross negligence or willful misconduct;
  • death or personal injury caused by our negligence, where applicable law (including the law of England and Wales and of other EU/UK jurisdictions) prohibits such a limitation;
  • any liability that cannot be excluded or limited under applicable law, including without limitation under California Civil Code §1668, under any comparable statute of another US state that applies to you, and under any mandatory EU/UK consumer-protection or product-liability law that applies to you as an EU/UK consumer.

9.4 Basis of the bargain. You acknowledge that the disclaimers, risk allocations, and limitations in Sections 2 through 9 are an essential basis of the bargain between you and us, that the Service’s pricing reflects them, and that we would not offer the Service on these economic terms without them. They apply even if any limited remedy fails of its essential purpose. Where a court or arbitrator finds any part of this Section 9 unenforceable as applied to a specific claim, that part is enforced to the greatest extent permitted, and the remainder of this Section 9 and of these Terms remains in full effect.

10. Indemnification

To the maximum extent permitted by applicable law, you agree to defend, indemnify, and hold harmless the MyThreshold Parties from and against any third-party claim, demand, action, or proceeding, and all resulting liabilities, damages, losses, costs, and expenses (including reasonable attorneys’ fees), arising out of or relating to: (a) your use or misuse of the Service; (b) your violation of these Terms or of applicable law; (c) your violation of any third party’s rights, including your device or data provider’s terms; or (d) any content or data you submit to the Service. We may assume the exclusive defense and control of any matter subject to indemnification by you, at your expense, in which case you agree to cooperate with our defense. If you are a consumer in the EU, UK, or EEA, this Section 10 applies only to the extent the claim results from your own breach of these Terms or of applicable law, or from your own fault, and only to the extent permitted by the mandatory law of your country of residence.

11. Governing law and jurisdiction

11.1 Governing law. MyThreshold is established in Bulgaria, a member state of the European Union. These Terms, and any dispute or claim arising out of or relating to them or the Service (including non-contractual disputes or claims), are governed by the laws of the Republic of Bulgaria and applicable European Union law, without regard to conflict-of-law rules. This choice of law is without prejudice to any mandatory provision of the law of your country of habitual residence that applies to you as a consumer and that cannot be derogated from by agreement — those mandatory protections apply to you in addition to, and prevail over, Bulgarian law to the extent of any conflict.

11.2 EU, UK, and EEA consumers. If you are a consumer habitually resident in the EU, the UK, or the EEA, you may bring proceedings arising out of these Terms either in the courts of Bulgaria or in the courts of your own country of residence, and proceedings against you may be brought only in the courts of your country of residence. Nothing in these Terms limits your mandatory consumer-protection, digital-content-conformity, or data-protection rights, including your rights under the GDPR / UK GDPR and your right to use any alternative-dispute-resolution or online-dispute-resolution mechanism available in your country. Any provision of these Terms that conflicts with such a mandatory right does not apply to you to the extent of the conflict; the rest of the provision and of these Terms continues to apply. Section 12 (arbitration and class-action waiver) does not apply to you.

11.3 Other users. If you are not a US user (Section 12) and not an EU/UK/EEA consumer (Section 11.2), any dispute arising out of these Terms or the Service is subject to the exclusive jurisdiction of the competent courts of Bulgaria, without prejudice to any non-waivable right under the mandatory law of your place of residence.

12. Dispute resolution — United States users

If you reside in, or access the Service from, the United States, this Section 12 applies to you. Because MyThreshold is a Bulgarian operator and these Terms involve foreign commerce, the Federal Arbitration Act (“FAA”) governs the interpretation and enforcement of this Section 12; the substance of any Dispute remains governed by the law identified in Section 11.1, subject to Section 12.5.

12.1 Binding individual arbitration. You and MyThreshold agree that any dispute, claim, or controversy arising out of or relating to these Terms or the Service (a “Dispute”) will be resolved by final and binding arbitration on an individual basis, administered by the American Arbitration Association (“AAA”) under its Consumer Arbitration Rules then in effect, before a single arbitrator. The arbitration will be conducted in English and, to the maximum extent the applicable rules allow, by videoconference, telephone, or on the documents only, so that neither party is required to appear in person in any particular country; if an in-person hearing is required, it will take place in a location the AAA rules designate as convenient for you as a consumer. The arbitrator, and not any court, has exclusive authority to resolve any dispute about the interpretation, applicability, or enforceability of this arbitration agreement, except that a court decides any dispute about the enforceability of the class-action waiver in Section 12.2. Judgment on the award may be entered in any court of competent jurisdiction.

Exceptions. Either party may (a) bring an individual claim in small-claims court if it qualifies, and (b) seek injunctive or other equitable relief in court to protect its intellectual property. Nothing in this Section prevents you from bringing issues to the attention of a federal, state, or local agency.

12.2 Class-action and jury-trial waiver. You and MyThreshold each waive the right to a trial by jury and the right to litigate or arbitrate any Dispute as a plaintiff or class member in any class, collective, consolidated, private-attorney-general, or representative proceeding. The arbitrator may award relief only in favor of the individual party seeking relief and only to the extent necessary to resolve that party’s individual claim. If a court of competent jurisdiction finds this Section 12.2 unenforceable as to a particular claim or request for relief, then that claim or request — and only that one — will be severed from arbitration and may be brought in court, and all remaining Disputes will proceed in individual arbitration.

12.3 Thirty-day opt-out. You may reject this arbitration agreement and class-action waiver by notifying us in writing (via the contact details in Section 17) within 30 days of first accepting these Terms, stating your account email and that you opt out of arbitration. Opting out of arbitration does not affect any other provision of these Terms. If you opt out, Disputes will be resolved in court as provided in Section 11.

12.4 Non-waivable state rights. Nothing in this Section 12 or in Section 11.1 waives, or is intended to waive, any right or remedy that a mandatory consumer-protection statute of your state of residence makes non-waivable — such statutes can apply to you based on your own residence regardless of where MyThreshold is established — including without limitation New York General Obligations Law §5-326 to the extent a court holds it applicable to the Service. If any such statute applies, this Section 12 and Section 11.1 are enforced to the maximum extent that statute permits, and the affected provision is limited or severed only as to you and only to the minimum extent required.

12.5 Mandatory US consumer law. Where a mandatory consumer-protection statute of your state of residence grants you a right or remedy notwithstanding the choice of Bulgarian law in Section 11.1, the arbitrator (or court, for a claim properly in court) will apply that statute to that claim.

13. Account, eligibility, and termination

You must be at least 18 years old (or the age of majority in your jurisdiction, if higher) and able to form a binding contract to use the Service. The Service is not directed to children. You are responsible for maintaining the confidentiality of your account credentials and for all activity under your account. We may suspend or terminate an account that violates these Terms, is used fraudulently or unlawfully, creates risk or legal exposure for us, or where required by law; where practicable we will give you notice. You may stop using the Service and request account deletion at any time. Sections 2–5, 8–12, 14, and 16 survive termination.

14. Intellectual property and license

The Service, including its software, design, computed-metric methodology, and content (other than your own data), is owned by us or our licensors. We grant you a limited, non-exclusive, non-transferable, revocable license to use the Service for your personal, non-commercial use in accordance with these Terms. You may not copy, modify, distribute, sell, lease, reverse-engineer, or create derivative works of the Service except as permitted by non-waivable applicable law. You retain all rights in the data you sync to or submit to the Service, and you grant us the license described in the Privacy Policy to process it in order to provide the Service.

15. Changes to the Service and to these Terms

We may modify, suspend, or discontinue the Service or any feature at any time. We may update these Terms; material changes will be reflected in the “Last updated” date above and, where required by law, notified to you in advance. Continued use of the Service after a change takes effect constitutes acceptance of the updated Terms; if you do not agree, stop using the Service and request deletion of your account. For EU/UK consumers, changes that materially reduce your rights take effect only after reasonable prior notice and do not apply retroactively.

16. Severability; entire agreement; miscellaneous

If any provision of these Terms is held invalid, illegal, or unenforceable in any jurisdiction, that provision will be modified to the minimum extent necessary to make it valid and enforceable while preserving its intent as closely as possible; if it cannot be so modified, it will be severed, and the validity and enforceability of the remaining provisions — and of the same provision in every other jurisdiction — will not be affected in any way. These Terms, together with the Privacy Policy, are the entire agreement between you and us regarding the Service and supersede all prior agreements on that subject. Our failure to enforce any provision is not a waiver of it. You may not assign these Terms without our consent; we may assign them in connection with a merger, acquisition, or sale of assets. Section headings are for convenience only.

17. Contact

Questions about these Terms, opt-out notices under Section 12.3, and legal notices: MyThreshold, Bulgaria, European Union, or the contact details published on the MyThreshold site.