Repetitive stress does not necessarily imply injury. It can be musically useful.
From a Ghanaian post office, a worker cancels stamps, spontaneously changing the pattern to fit each envelope:
Another example from a Ghanaian post office, an ensemble:
Various styles of counting cash, far less interesting than the basic pulse of each sequence are the rhythms internal to each pulse:
(See also this: Villagers in Iseh, Karangasem, Bali, stomping rice, in interlocking patterns.)
And this: from Robert Bresson's film Le Diable Probablement. Bresson, preferred not to use non-diegetic music in his films, but his use of sound was nevertheless extremely musical. This example uses diegetic noises to propel, through their increasingly rhythmic character, a didactic sequence (Bresson wrote: "Image and sound must not support each other, but must work each in turn through a sort of relay.")