I always heard that you aim to lose max 20% muscle on a good cut. So what you're saying is you really only lose glycogen (water) which makes muscles only APPEAR smaller. However your muscle fibers (ie. the actual muscle) actually STAY THE SAME IN SIZE. Well that's just fine and dandy if you're an athlete and are mostly concerned with strength and performance. However: if you're mostly concerned about appearance you don't want that glycogen depletion with the resulting "flat" look so you stay away from cardio.
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