VR boxing. High cardio, works a reasonable amount of muscle groups. 30 minutes should be plenty, and there's other VR stuff you can try although none quite as good for fitness.

Buy one of those cheap ocules headsets and if you don't like it or get bored you can probably get most of your money back by selling it. And yeah the facebook integartion stuff sucks but there aren't really any other options in that price range or with a similar ability to just pick up and go with it.