I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn't work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I'd gladly replace if it broke.
It was kind of a stupid purchase for me because when I got it I wasn’t really into doing exercise or outdoor stuff.
Sigh... the notion that bikes are just toys or exercise equipment is such a harmful misconception, it's ridiculous. Rather than writing a huge wall of text trying to explain the vast depths of how important cycling is I'll just cite this blog post this blog post that explains it better than I can.
Of course, that article was written from an individual perspective, so even it manages to understate how important cycling is. Americans' dismissal of cycling in favor of driving, and the car-dependent [sub]urban design that results from that choice, is the underlying cause for the housing crisis and all the other crises that stem from that!