Thanks again for all the help. Does this sound right? Can you have a mix of 3 different arts?
read
http://www.mafitnesscenter.com/juniors.html
This place doesn't look like a school where you're going to learn much in the way of practical MA, whatever aerobic workouts you do. The stuff on TKD, for example, is laughable---90% foot techniques and only 10% hand techniques? There are probably as many different
blocks in TKD as there are kicks! If you look at the hyungs---the patterns of movements in TKD, corresponding to katas in karate and similar patterns in Chinese and Indonesian MAs, which record the technical elements and how these can be combined into effective combat techniques---you'll see that even the most advanced and difficult forms have far more instances of hand techniques among the moves than foot techniques. The emphasis on Olympic sparring is a giveaway: they're telling you that you're going to be exposed to a few bits and pieces of a specialzed version of TKD that ignores the vast majority of the technical content of TKD, including various kinds of grip/strike combinations, locks, throws, sweeps, elbow strikes and a ton of other stuff.
I suspect the judo you'd be exposed to will be similarly gutted.
If all you wanted to do were aerobics using MA moves it probably wouldn't matter. But from your post, I gathered that you want to study MA seriously, and that you were worried about conditioning as an obstacle to that study. If I'm right about that, then what you should do is find a school that teaches a single MA
in depth---and any real MA with a bit of history behind it has a lot of depth to explore. Mixing MAs when you don't have a solid background in any one of them is very likely going to leave you knowing not very much, especially not very much that you could actually
use. Avoid places with profiles like this one if you want to develop the range of skills that the MAs make available to you...