“Interesting” is fine — but adding one detail makes you sound more natural.
Upgrades:
- That’s interesting — I didn’t know that.
- That’s a great point.
- That’s interesting — how did you find that out?
- What makes you say that?
Mini practice (20 seconds):
Reply with an upgrade + 1 follow-up question:
“I started waking up at 5 a.m. every day.”
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