This has been an interesting discussion.
I've had back problems for about the last 30 years, not crippling but I have to be careful. Whenever I tweek it, it takes a couple of days rest for it to calm back down. 10 days ago, I was moving the portable generator and changing the oil when I hurt it big time. I've been recovering ever since. I've reached the point where I can walk but feel every step and I can now sit without pain. Getting up from a sitting position takes a while and involves much teeth clenching and, heaven forbid, that I twist or turn in the wrong way. I could fall and have. It feels as if it will take another week or so before I can function semi-normally.
It's so frustrating as I was getting so much done around the place. It was starting to look good and now I'm falling further and further behind. My poor wife tries to help but after mowing our 4-acre yard, she had to rest up for a couple of days because she got bounced around so much. What a pair we are. It'll be interesting to see what the next few years will bring.