Back has gone again

I’ve hurt my lower back in the past, and it’s a pretty uncomfortable thing to have happen. I hurt it again today. I wasn’t actually doing anything strenuous at the time at all; I had just opened the back of the car and started leaning forward to take something out when I had a massive stabbing pain in my lower back. Having hurt it in the past I can confidently say it has never been this bad. It was so painful and so sudden I dropped to the ground.
Lisa took me to the phsyio a few hours later, and I’m going back tomorrow, so hopefully I can recover quickly. I’m dosed up on painkillers and anti inflammatories and spending a lot of time lying on the couch in whatever position I can find that’s comfortable. Not happy.
I know I’m overweight and have a particularly bad posture and I have to fix both those things. It’s a pure coincidence that I turned 43 yesterday, but I’m clearly not getting any younger and I’m starting to feel it.
Who said what?