Ask HN: How are you actively keeping your thinking sharp while using LLMs daily?

I've noticed AI tools have made me lazier. I used to think and reason through problems deeply, writing out my thoughts, going back and forth on items. With LLMs so easily available, I find myself having a conversation with Claude instead. I'm concerned that I'm not exercising my deep thinking muscles much.

Anyone else feel this? And more specifically — what deliberate practices are you using to keep your reasoning sharp?