About
The most complete triathlon time, split, and pacing toolkit on the web.
Triathlon Regimen turns strong endurance-sport research into practical calculators that help athletes make better choices about training, pacing, and race execution.
What this site is trying to do well
Useful numbers, honest framing, and better triathlon decisions.
Triathlon training sits at the intersection of physiology, pacing, durability, logistics, and judgment. Many tools focus only on the first of those. Triathlon Regimen keeps the full context visible.
That means a calculator should not only produce a number. It should help the athlete understand what the number is good for, what assumptions it depends on, and where real life can push the result away from the model.
The ideal output is not “a more impressive number.” The ideal output is “a better next decision.”
Build Principles
Self-coached age-group triathletes
Coaches and reviewers
Athletes who care about trust
What Triathlon Regimen does not claim
The site does not claim that calculators replace medical advice, individualized coaching, or race-day judgment. It also does not claim that every endurance model is universally accurate across every athlete, course, condition, and training history.
Where the evidence is strong, the pages should say so. Where a section relies on a practical coaching heuristic, the page should say that too. The trust model is built around drawing that boundary clearly.
How pages are reviewed
Every calculator page is reviewed for formula quality, copy accuracy, mobile usability, consistency, and citation strength before publication.
Strong pages include clearer methodology notes, visible on-page assumptions, and practical exports or planning modes that athletes can use immediately.
Trust and next steps
The strongest pages should be easy to inspect as well as easy to use.