I just came across this article, it makes for an interesting read and the exercises at the end look pretty simple and perfect for this frozen ground period when you can't do much more than walk, thought it might be of interest for people 
http://horsetalk.co.nz/2015/02/04/help-horse-kissing-spine-goodbye/
http://horsetalk.co.nz/2015/02/04/help-horse-kissing-spine-goodbye/