Sub-3

Sub-3 describes itself simply: "Sub-3 is the definitive resource for breaking a three-hour marathon, expert training, gear and fuelling tips, in-depth race rankings, performance data and real runner stories." To AI engines like ChatGPT and Perplexity it is partially visible, scoring 5.0 out of 10, readable in places and missing in others.

On the page itself the strengths are clear: a clearly stated business identity and sitemaps and entity links AI can follow. It is passable on some structured data, a workable page structure and basic crawler access. What holds it back is credibility markers like credentials or reviews.

Off the page there is only faint evidence that only a handful of sites link to it and the domain is only lightly established. Beyond that, AI engines do not yet recognise it as a distinct business, there is no press coverage to draw on, nobody is discussing it where AI engines look and it does not come up on Reddit. Those are earned elsewhere on the web, not fixed on the site itself.

AI crawlers have visited once in our tracking, including ClaudeBot (Anthropic). It does link out to several social profiles, which helps engines tie the brand together.