Gyms in Zuffenhausen?
 

I'm considering ED for my next Porsche but am a little reluctant to take two weeks off from the gym for the trip - I no longer have the resiliency I once enjoyed in my youth so extended periods off are much tougher to recover from! In the US gyms with daily memberships can be found just about anywhere so I'm wondering how prevalent they are in Europe, (especially around Zuffenhausen) these days. My previous trips to Europe had always been for a week or less so I never looked into it before.

Stay at the better hotels. They'll have workout areas.

For reference the Am Schlossgarten Hotel does NOT have a gym

You can try to locate gyms using this:

https://www.lesmills.com/?findaclass=

(Only gyms with Les Mills group training though but a way to locate gyms.)

I go to gyms when in Germany and generally there is no problem going as a non member.

Sometimes it is free, sometimes I have to get a day pass.

Hopefully you are taking the car out of town. Once you hit the road just look for "wellness" hotels and resorts. They almost all have decent facilities (and excellent spas btw).... although make sure you understand German spa culture before you go spaaing around :) Its a bit different than what you may be accustomed to.