I have posted this one before, but the difficulty of getting those crashing Early Romantic Chords with the bizarre technique that Glenn Gould uses is fabulous. He sits
much lower than most pianists, (and always on a chair that his father built for him) so that the kineseology of how he pushes the keys for the loud chords is different than any other pianist. Basically most pianists sit closer and higher and use their lats to push the keys hard for loud Beethoven chords. Glenn used basically his rotators.
Concertizing, particularly acoustic instruments without electronic enhancements, is an athletic event...