Preparing for a role, especially one that is based on a real person, sometimes means spending a lot of time with that person, literally or metaphorically, and getting to know everything about them. Rami Malek prepared for a year to inhabit Freddie Mercury in Bohemian Rhapsody. He studied him, learned his movements, wore false teeth, and had a strict diet and exercise regimen to become the Queen singer and do him justice.
Article source: https://www.cinemablend.com/news/2466841/rami-malek-fell-in-love-with-freddie-mercury-during-bohemian-rhapsody