Any cardio would be good, for most things in general and especially to assist with endurance. I would think the aerobic you are doing isn't sustained for a very long time. At least 30 minutes at a shot would be good and work up to an hour as you progress. But I am assuming you aren't doing as much continuous in the training you mentioned above. If you're already doing 3 classes a week 1-2 more of these would probably be good.
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