Actor J.K. Simmons explains why he refused to have a body double for his movie Whiplash. The sophomore feature from Oscar-winning director Damien Chazelle, Whiplash is a story about an ambitious percussion student named Andrew who sees his dedication and morale tested during his run-ins with an intense instructor named Fletcher. Whiplash received critical acclaim during its 2014 release, and won Oscars for film editing, sound mixing, and Best Supporting Actor for Simmons.
https://screenrant.com/whiplash-movie-jk-simmons-body-double-no-explained-response/