This is [what they teach](https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Book%3A_Introductory_Biology_(CK-12)/13%3A_Human_Biology/13.01%3A_Muscle_Contraction#:~:text=The%20most%20widely%20accepted%20theory,the%20actin%20filaments%20closer%20together) in college physiology and anatomy.
The idea is that beads of muscle slide over each other as reactive minerals like calcium get released.
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