piano fitness is internal investigation. looking inwardly to see what you feel. like a detective, finding clues to solve the mystery of how. broken down simplistically, like computer code 0/1, f/p. listen for any 2nd note to be softer than the 1st note. i.e. if 1st note is pp then 2nd note is ppp.
practice:
op 53 apply this principle to: l.h. 8vas! - the most technically challenging
the "heavenly" beginning of the end
the r.h. solo waltz immediately afterwards
