You should come with me one morning. They have a kinderbetreeung there and this is why I can go as often. The zumba-tonic class on Thursdays is from 10-11. This morning i can't go cos Emilie is sick but nexy Thursday I'll definitely be there.
check this as well: my zumba teacher has a blog and you will see all the zumba events and classes that she does in Bern:
http://www.swisszumbafitness.com/zumbaclasses.htm