Ooooh! Ouch! You may know the feeling. You've made some unwise movement that involves twisting your back. Or you've held an awkward position for too long. And your lower back protests. It's now happened to me again, and until mid-week I'll be stuck with a bad back.
For me, this is an occasional problem, unconsciously or stupidly self-inflicted, that I've been prone to since the 1990s (which was
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