BCAA and glutamine, as Marsoc said, is a tremendous aid for not getting catabolic. So if always include that when doing cardio, or lifting for that matter.
Interval training is supposed to be better for increasing stamina without tearing away at muscle mass. But I don't know if it will be as effective when it comes to fat loss.
But main point here is that you can get very muscular and still do lots of cardio.
So you don't need to be afraid of it IMO.
(But use supplements, BCAA are actually fat burning as well as anti catabolic)
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