Had a few tough days lately. Tough as in with a significant element of fear. They are interesting. There is a pattern in they happen and in the response.
I never seek these days. They either can't be avoided, or happen because I've misjudged the challenges of the day: wind, current/tide, swell, coastline/water depth profile... Tough is usually either a struggle to get to land, or a struggle to make a landing.