I have not seen yoga classes offered along the
Camino Frances, though I would love it if there was. It could be extremely helpful. I've been practicing on my own along the way. During my last camino, I brought along a grippy yoga towel. This time, I just use the bed for reclining poses, and the floor for standing poses. If you would like the guidance of a class, there are plenty of good ones on youtube.
I know it isn't the same sense of community as an in-person class, but it can be quite contemplative, and helps get the knots out from long days of walking.
It also just occurred to me that the yoga sequences I do on the camino are a bit different from what I would typically do at home.
I really tend to spend a lot more time stretching, more time in restorative poses. I don't want to aggravate muscles that may already be getting overused, so my goal is to achieve ease and balance, which may happen more readily through a personal yoga practice where your primary goal in determining which poses or sequences to follow is listening to your own body.