British Obstacle Sports 2025 Rulebook

The Competition Rules is the Master Source Document (MSD) for British Obstacle Sports covering OCR and ninja sport rules in the UK. The web based document acts as the official (authorised) reference document and is maintained based on authorised amendments in accordance with recommendations by British Obstacle Sports Technical Committees and accepted by the British Obstacle Sports Board. Any difficulty in the interpretation or application of Rules should be referred to British Obstacle Sports.

Version 3.4 of our rulebook comes into force on December 7th 2025.

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British Obstacle Sports Rulebook Contents

  1. Introduction
  2. Definition of Key Terms
  3. Conduct
  4. Athlete Communication
  5. Uniform
  6. Right of Appeal and Protest Period
  7. Anti-Doping Rules
  8. Disciplines Classification
  9. Obstacles
  10. OCR: Cross-Country (OCR XC)
  11. OCR: Furthest Fastest (OCR FF)
  12. OCR: Natural Terrain (OCR Trail)
  13. OCR: Cross-Country Time Trial (OCR XCTT)
  14. OCR: Track Time Trial (OCR TTT)
  15. Penalty Formats for OCR
  16. Ninja Sport: Furthest Fastest
  17. Ninja Sport: Points Based
  18. Ninja Sport: Time Trial
  19. Ninja Sport: Head-to-Head
  20. Ninja Sport: Relay (Leg)
  21. Ninja Sport: Relay (Lap)
  22. Ninja Sport: Skills event

Appendix A – Primary Obstacle Challenges Definition
Appendix B – Ranking Categories
Appendix C – Event Format Deviations
Appendix D – Race Protest Form
Appendix E – Race Protest Decision Form
Appendix F – Changelog