I did yoga on wii fit for a while last year and I noticed that it transfered to my riding. I was more flexible and stronger (especially in my legs) and I felt more balanced and centred. I was a lot more toned as well after a couple weeks doing it.
I liked doing it for balance on wii fit because you had to stay centred on the little wii fit board and I had to really focus on it to keep my centre of gravity.
I would definitley recomend at least going to a couple classes, or if you already have a wii, just get wii fit and use that.
I did it half an hour a day for a couple months and there was a big difference.