It could be over a few months, like a new job where one day you feel like actually going to work thinking, hey I actually like these people and don’t mind working here.
Or when your friends have been super busy for months and suddenly you get matched on dating apps, old friends reach out and people want to buy your old junk on Craigslist in a single day.
I was always mildly overweight growing up, despite doing enough sports and physical activity to be relatively fit. One day a flip switched and I started going to the gym daily. 6 months later, while doing cardio I pulled something or otherwise hurt myself and a month of back and forth later discovered I have herniated discs. My trajectory very much went downhill from there. PT made me miserable, the steroid epidural didn’t work. I was too young for surgery. I had to get rid of my motorcycle since riding it caused me to be bedridden in pain. I had to stop any recreational sports. Going shopping is rolling the dice over whether I’ll be in pain the next week.
Lift with your legs, not your back.