We posted about conditioning and related topics last week. We talked about measuring progress. I'd say that if you can get through my Friday morning fitness class, and if your body weight is right for you, you are in decent condition. But when you begin, you plain suck and hate yourself because you are not in good condition.
Newbies have trouble at first, but the ones who stick with it religiously make good progress.
That class is cardio and endurance, but those things are important. A 4-minute rower sprint is a bitch. I can not sprint for 4 minutes, have to pace myself.
So although it's difficult to put a number on fitness class performance, you can get a sense over time about how you are doing/surviving a class. Or you can compare yourself with others, which is a bad idea but difficult not to.
At my gym, the classes are free. Usually it's 50/50 guys and gals in early morning. They kick your ass, start the day right. Give it a try for a few months, and see what happens. I do one or two weekly, and count it as my calisthenics. Difficult to call it "fun," but there is some comaraderie.
An hour after finishing, you feel great.