If you need temp space, please check out www.GymLynx.com. You can see images of the gym, plus equipment, amenities, etc.
And if the question is about renting your own space, I look for the following.
Price- let’s face it, overhead is the biggest factor in being able to run a profitable business.
Size- How much space do I need now? and how much in the near future is also important.
Location- I could have the best gym in the world, but if it is hard to get to, no one will come there.
Parking- Does the space have adequate parking for the number of clients I will have in the space at any one time.
Exposure- Will the space do some advertising for me? Can people driving by see my signage? (Kind of goes with location, but is a little bit of it’s own category too.)
All of these make a difference. And I can sometime work around a few with a little effort. I listed them in the order of most to least important to me. But one can totally affect the decision pro or con. Like if there is no parking in reality. If the lot is full all day from other businesses traffic it is good for exposure, but bad for clients. So, I attempt to get some dedicated parking spots for my business. I won’t rent without them in that situation.
I tried doing the sublet/rent space from an existing studio a few times. I always ended up getting my own space. The inconsistency of being in a shared space and the frequent time conflicts with others leasing the space was just an irritation. But it did give me the nudge to get out and do it on my own.
Location Location Location
Also, I would ask yourself what demographic are you trying to service (wealthy vs blue collar, young vs old) and make sure the location is up-to par with your preferences.
Best of luck!