About subninety.club
A HYROX research archive built from real athlete data. One race so far, with more to come — each treated as a complete dataset, not a hot take.
The site
subninety.club is a HYROX research archive built from one athlete’s data. The premise is simple. HYROX is a sport with surprisingly little measured analysis behind it. There’s no broadcast analytics dissecting heart rate decisions, no public datasets showing how bodies handle the run-station-run-station sequence that defines the event, and the conversation online is mostly anecdote: “do more burpees,” “save your legs for Run 8,” “go heavier on Wall Balls.”
This site puts numbers behind it. Every chart on every page is generated from real measurement data captured during a real race. The data sources are stated. The methodology is shown. The conclusions cite the data, not training-Instagram conventional wisdom.
The current pillar piece — a complete heart rate analysis of HYROX Bengaluru 2026 — and the spoke articles being built around it will be followed by more races as I run them, each treated the same way. Over time, the goal is to be the most credible reference on what HYROX racing actually looks like as a measured event.
The author
[REPLACE: A few sentences about your background. What you do for work, what drew you to HYROX, how long you’ve been racing, any training partners or coaches worth naming. 2–4 sentences is plenty.]
Outside of subninety, I’m also the founder of Prime Longevity Labs — a no nonsense platform for top performers to optimise their health and achieve peak fitness does]. The connecting thread between the two projects is an interest in what high-resolution biological data can tell us about training, recovery, and performance: what you actually observe versus what you’re told to assume.
I have already completed two Open Hyrox races (Hyrox Mumbai 2025 and Hyrox Bengaluru 2026 and planning two compete in Hyrox Delhi and Hyrox Mumbai in July and September respectively
Why this exists
The category is genuinely under-served. HYROX has grown faster than its measurement and analysis infrastructure. There’s no Reuters of HYROX. There’s no FiveThirtyEight of hybrid fitness. The athletes producing the data don’t generally produce the analysis; the analysts don’t typically have the athlete’s hardware on their wrist during the event.
subninety.club tries to close that gap, one race at a time. The cadence is roughly weekly. Each spoke piece is short, focused, and answers exactly one question. Every chart on every page comes from real data; every conclusion cites it.
If the project finds an audience, it’s people who want to understand HYROX the way data journalists understand baseball or marathons — not just “what happened” but “why,” and what does this tell us about the next race.
Methodology, briefly
All heart rate, cadence, and energy data come from an Apple Watch worn during the race, exported via the Health Auto Export iOS app. Segment durations and split times come from official HYROX results. Every page on this site states its specific data sources and any relevant caveats — sensor gaps, validation limits, sample sizes — in a methodology section at the bottom.
A fuller methodology document is in production at /method/ and will cover the full data pipeline, the assumptions behind zone calculations, the accuracy of Apple Watch active_energy estimates, and how segment timing is reconciled against the race-day chip mat.
Contact & corrections
For corrections, dataset access requests, or research collaboration: .
—Twitter/X @subninetyclub · Instagram @subninety.club
Corrections are treated seriously. If you find an error in the data, the math, or the interpretation on any page of this site, write in and it will be fixed and noted. An errata log is part of the methodology page.