The related-questions box on a results page is a direct, validated list of what people searching a topic want answered next, which makes it a strong long-tail source.
Treat Each Question as a Potential Long-Tail Target
A question like "how long do running shoes last before replacing" is itself a long-tail keyword worth its own section or page.
Follow the Box as It Expands
Clicking into one question often reveals new related questions underneath it, letting you go several layers deep into a topic's long tail.
Use the Exact Phrasing Where Natural
The way a question is phrased in the box often mirrors real search language closely enough to use directly as a heading or target phrase.
Next step: Use the Longtail Keywords Tool to confirm the questions you're finding actually connect to a broader long-tail opportunity worth targeting.