This Week In Wellness better motor skills in first grade have been linked to better performance in reading and mathematics in the 3rd grade in a recent study at the University of Jyväskylä, Finland. 

https://www.news-medical.net/news/20230525/Motorically-skilled-children-in-first-grade-have-better-academic-skills-by-third-grade.aspx

https://journals.lww.com/acsm-msse/Abstract/9900/Cross_Lagged_Associations_between_Physical.239.aspx