I recently came across a very intriguing video. It features pianist Norman Krieger, a professor at Indiana University in the United States, discussing various aspects related to 16 pianists. Within this video, he introduces a practice method he learned from Martha Argerich. I've provided the link to the video, so please skip to 9 minutes and 44 seconds to see the part about Martha Argerich.

Professor Krieger shared that when he once played in front of Martha Argerich, he struggled with the intricate notes in Beethoven's Sonata Op. 2, No. 2. At that moment, Martha Argerich shared the practice method she had learned from her own mentor, the renowned Argentine teacher Scaramuzza.