Ha, the Bosu exercise only works if you can actually stand on it on one foot...
And you have to have good balance for that! When I belonged to a gym, I didn't go to the Bosu classes, because they were full of people (mostly cyclists) who made fun of the people who fell off of the Bosu.
I can do the yoga sequence Oak describes, although I am shaky if I don't do it on a regular basis. My balance sucks, always has. Sometimes, I am truly amazed I can ride, but it certainly is the reason for my terrible handling skills.
2015 Trek Silque SSL
Specialized Oura
2011 Guru Praemio
Specialized Oura
2017 Specialized Ariel Sport