How myosin and other protein machines work at the atomic level is actually pretty well-known! [1] Myosin and its partner actin use the same biophysical principles, such as hydrogen binding and protein conformational change, as other proteins. But whereas other proteins typically act on the scale of atoms (doing things we think of as “chemistry”, such as making or breaking chemical bonds), myosins and other molecular machines are directly and physically responsible for the macro-scale movements of beating wings, walking legs, and beating hearts.
On the subject of molecular machines: it’s sometimes asked why biology doesn’t use the wheel. Protein machines like ATP synthase [2] (which creates the ATP used by myosin to create movement) provide an answer