well, they're applying 5-10 minute massages twice a day on the affected area, so that part is taken care of.
I also recommended <1h walks on the fields, moderate speed walking, slow trotting when going downhill (mild inclinations only).
I talked to a vet today, and to an experienced rider. They both agreed that unilateral training can be a tricky solution, since it can cause an over-development of previously simetrical muscles on other parts of the body.
They suggested the cautious use of a "chambon" (i suppose the term is the same there), and a lot of work with the neck lowered.
The vet also sugested electric stimulation of the underdeveloped muscles (very expensive but effective).
I like the idea of some lateral work. And combining it with small doses of the chambon might actually speed up the healing process.
Thank you, and if anyone else thinks of some other exercises, please let me know.
"There is something about the outside of a horse that is good for the inside of a man. ~ Winston Churchill"