” none of them were professional piano players or trained as typists.”
So: teaching myself to type at max speed and play piano as fast as possible as a teenager helped train my precision millisecond-level timing (which likely helped me retain attention (ADHD mitigation)
_White Matter Integrity of Specific Dentato-Thalamo-Cortical Pathways is Associated with Learning Gains in Precise Movement Timing_
https://academic.oup.com/cercor/article/25/7/1707/457676