Each school is different in their curriculum.
When I was at Torrance years ago, it was a solid hour of techniques and training. No warm ups or cardio.
Since that time, I've been to two other schools and warm up, stretching and cardio was included.
I assume, this may not be correct, but if you're overweight, your cardio may be lacking. If I were you, I would try to build up your cardio before you attend this class since that will help and add to your enjoyment of the class. If this school does some excersises in the beginning, you may be huffing and puffing to get oxygen and not concentrate on the techniques being taught.
Our school usually has stretching and cardio warm ups, then some techniques and then sparring. But sometimes it totally changes. It's never the same, which keeps training from being a routine or a rut.
To enjoy Jiu Jitsu or any other martial art or sport, you first need a solid base of conditioning to start off. There are many ways to build this up. If you have been sedentary for a while, start to walk a lot and go from there to running or maybe a tread mill or bicycle.
If I were you, I'd go to this class, watch and see if you can hang with what they do. Also talk to the instructor about your present conditioning and any concerns you have.
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