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Time under tension is a red herring. If TUT mattered, planks would build massive abs. They don't. Because there's no progressive overload of mechanical tension. The plank gets longer. The abs don't. A 5-rep set takes around 15 seconds. A 15-rep set takes around 45 seconds. Both can produce...

21,435 views • 3 months ago •via X (Twitter)

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When you train in the 10-12 rep range, most of your reps have no direct effect on growth. When you train in the 4-6 range, virtually all of your reps are growth reps. Both ranges can build muscle. The mechanism doesn't care about the rep count. It cares about how close you get to true failure on the reps where the high-threshold motor units are recruited and every available fibre is firing. Those are the stimulating reps. Everything else is filler. The catch with 10-12 is twofold. First, only the last 4-5 reps in a 12-rep set are actually stimulating. The first seven are buffer. They generate fatigue, lactic acid, and joint wear that the muscle has to push through before any growth signal arrives. Effort, yes. Stimulus, no. Second, and this is where the high-rep crowd quietly come undone: the long set produces so much afferent feedback (burning, gasping, the legs giving a small philosophical speech) that almost nobody actually takes the set to true failure. They stop two, three, sometimes four reps short, mistake the discomfort for the limit, and call it a hard set. The stimulating reps they were chasing never showed up. A set of 6 doesn't allow that confusion. Failure is mechanical. The weight either moves or it doesn't. No interpretive dance required. You'll grow on 10-12. You'll grow more on 4-6, with less joint wear, less recovery debt, and considerably less guesswork. One range tolerates your mistakes. The other doesn't have room for them.

Sama Hoole

62,986 views • 2 months ago

There is not a muscle on the body that needs high reps to see its best growth. This is basic physiology. Yes, muscles vary in their ratio of slow to fast twitch fibres. It doesn't matter, for two reasons: 1. Slow twitch fibres reach their ceiling early. They are not the limiting factor. 2. As you approach failure, every fibre is recruited regardless. The body does not leave capacity sitting idle when it thinks it's about to fail. Here is what actually drives hypertrophy: involuntary slow contractions. The point in a set where the concentric is grinding, the bar speed is dropping, and the muscle is being forced to recruit everything it has just to complete the rep. That is mechanical tension. That is the growth signal. It only exists in the final five or so reps before failure. Everything before that is your body coasting on the fibres it was already using. Some muscles tolerate high reps better than others. Calves are the classic example. But tolerating junk reps is not the same as benefiting from them. It just means the damage is less visible. The reps are still junk. If you are living in the 8-plus rep range, most of your set is happening nowhere near that zone of involuntary contraction. You are accumulating fatigue, impairing recovery, reducing training frequency, and spending more time under the bar: in exchange for a growth stimulus you could have captured in a fraction of the reps. More reps past the point of failure proximity is not more stimulus. It is just more cost.

Sama Hoole

15,967 views • 4 months ago