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SESK: Stuff Everyone Should Know · sesk.info/lift-muscles-grow-during-repair

What is the main training stimulus for muscle growth?

When your body repairs those tears, during recovery.

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  1. Mechanical tension from challenging the muscles ✔
  2. Muscle soreness by itself
  3. Tiny tears that must happen every workout

Why: Mechanical tension is the primary stimulus for muscle growth. Muscle damage can happen, but it is not required for hypertrophy.

Huh, didn't know that: You can build muscle without feeling sore after every workout.

The dad joke
I'm not lazy, I'm growing. My muscles do their best work on the couch.
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References

Answer: Mechanical tension from challenging the muscles. Mechanical tension is the primary stimulus for muscle growth. Muscle damage can happen, but it is not required for hypertrophy.

  1. Load-induced human skeletal muscle hypertrophy: Mechanisms, myths, and misconceptions | PubMed pubmed.ncbi.nlm.nih.gov/41276164
    Mechanical tension is widely recognized as the primary stimulus underlying the molecular mechanisms that influence muscle hypertrophy induced by resistance training.
    Checked 2026-10-12.

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