I wish I knew what was different when back didnt hurt before @Bunniekins only been like this last 3 years or so and have been able to manage it  to some degree in past well before stopping again. bit silly like recently trying to pretend not hurting while thinking how long til get home and making fists to try and distract myself . funny . get home , sit down.5 mins later its fine. so maybe lots short walks to start with