Have never tried to play the violin - it was not available in my school growing up, though I checked that box off on the form ... so I'd have to say sing an opera.
Would you rather get motion sick easily, or have balance problems when tired?
(Yes the two are linked. Before my brain surgery, I got motion sick REALLY easily - ask any sibling of mine who ever had to ride in the car with me - but now I don't get motion sick at all, but have half the balance of a normal person!)
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