What is the best way to build up my horse's back muscles? He is a rescue who hasn't been ridden in a few years and really needs to get his back in shape. I am open to ground work especially as I am hesitant to fit him with a saddle until I get him in better shape.
I tried to get him to do back lifts by touching his tummy, but it isn't working. The vet showed me how to do it by running my hands along the sides of his tail, but I can't seem to replicate it.
Any help at all would be appreciated!
Here's a pic of said horse and his back: