:D When I had severe back issues I was given a number of exercises to strengthen my core, @neumannsalva. Some involved sort of putting my weight on my arms : no way ... I've got lots of brain power and will power but, alas, not enough arm power.
I still do some of the exercises but not enough and lifting / shifting boxes to sort things out doesn't help (well, let alone weeding !). So I have lots of knitting / crocheting breaks with nice cups of tea to keep me going :D