The whole Tennishackery gang Alex, Soham and Tarun get together to discuss tennis fitness: what, why and hows.
Resources
Risks of early specialization in tennis
Dr Mark Kovacs itpa-tennis.org
https://kovacsacademy.com
Some good Instagram accounts
https://www.instagram.com/_baselinepower_/
@squatuniversity.
Disclaimer - Do not learn stuff especially olympic lifting and friends without proper supervision and training.