The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
So the main fuels that we use for exercise are the fatty acids and glucose. And those are oxidized or burned in the different skeletal muscle fibers that we have. So we have the slow twitch muscle fibers and the fast twitch muscle fibers. The fast twitch muscle fibers are divided in two, the type 1a and type 2b, if you will. Some people call them type 2x as well, but they're two kinds of muscle fibers.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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the type 1 fiber has lots of mitochondria surrounding the fibrils within the sarcomere as you said it is readily able to access glucose and fatty acid oxidatively conversely the type 2x fiber i don't even think it has mitochondria surrounding it it's purely a glycolytic tool meaning it's going to basically have to go glycogen to glucose to lactate
and that is mostly explained by more metabolic apparatus what's enabling the speed