Most anyone who has ever played piano has a love-hate relationship with the “Hanon” book.
The Virtuoso Pianist (Le Pianiste virtuose) by Charles-Louis Hanon, is a compilation of sixty exercises meant to train the pianist in speed, precision, agility, and strength of all of the fingers and flexibility in the wrists.
First published in Boulogne, in 1873, The Virtuoso Pianist is Hanon’s most well-known work, and is still widely used by piano instructors and pupils although some teachers are getting away from the mechanical playing these can produce.
Personally, I’ve sometimes played these on “auto-pilot” since all one really needs is to get the first pattern going, then move up a step, up a step…
Notes by C. L. Hanon: Preparatory exercises for the Acquirement of Agility, Independence, Strength and Perfect Evenness in the Fingers. For studying the 20 exercises, begin with the metronome set at 60, gradually increasing the speed up to 108.