You will find the standard of English in Switzerland is generally quite good - so I don't think you should struggle to a fitness/yoga class with an English speaking teacher. Just ask around at the studios/gyms close to your area.
It is also not a bad idea to brush up on your Swiss-German skills, the locals will always appreciate it when an foreign makes an effort to speak to them.
Read more about some of the cultural obstacles faced by expats moving to Zurich on the Culture Shock in Switzerland page.
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