stellarintervals.com

stellarintervals.com is a live English-language website hosted on Cloudflare, Inc. (AS13335) in the United States, served by Cloudflare. cl0q first saw it on 2026-10-19 and last crawled it on 2026-10-19. It resolves to 104.21.87.109. Its favicon is fingerprinted by SHA-256, so you can find every other site that serves the same icon.

How the site describes itself:

Stellar Intervals · Train at VO₂max — the Norwegian 4×4, done right

A threshold-gated interval timer for the Norwegian 4×4 VO₂max protocol. The clock only counts while you're above 85% of max heart rate, so every session is four full minutes in zone — and it tracks heart-rate recovery as a proxy for cardiovascular fitness. Works with Polar, Garmin, and AirPods Pro 3.