Well, I own a Quarter Horse gelding and at the start of the year myself and my mum moved away from his old paddock mates and so now he doesn't get near as much work as he used to. During this time he managed to get a horrible case of rain scouring and so he dropped a fair amount of weight. I'm not to worried about that, he's slowly starting to gain it now its warming up a bit.
But he lost all the muscle on his bum, and being a QH he had packed it on with all the work. Now his bum's all skinny and ew :P
How can I build this muscle back up? Any ideas?
Remember I don't have hills and whatnot to canter up, I have a big paddock with long grass and a few areas of workable ground.