The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
The way we recruit muscle fibers obeys a sequential pattern. that is very similar to the stick gears of a manual car. So you first start and you go in first gear and as the RPMs go up, then you get to a point you get to the red zone. So that car cannot keep up with that first gear. You need to shift to second gear. and you speed up and the RPMs go higher, and then eventually you need to shift to third gear. This is very similar to what happens at the skeletal muscle.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
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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As the intensity increases, we have to start recruiting more of the type 2 fibers. These are fast twitch fibers which again are more contractile in their force but they're also fast to fatigue. They have less mitochondria and they're going to recruit uh and rely more heavily on glycolysis. Um that's happening outside the mitochondria.
And then as you increase the intensity of exercise, increase the force of, you know, or the weight of something that you're moving if you're lifting weights that you're going to progressively activate more type one fibers and then move on to the type two fibers eventually.