Fairouz Ai is a Japanese voice actress who is affiliated with Raccoon Dog. She played her first major role as Hibiki Sakura for the anime series How Heavy Are the Dumbbells You Lift?. She also played Manatsu Natsuumi/Cure Summer in Tropical-Rouge! Precure, Emily Orange in Kandagawa Jet Girls, Eripiyo in If My Favorite Pop Idol Made It to the Budokan, I Would Die, Jolyne Cujoh in JoJo's Bizarre Adventure: Stone Ocean, Delta in The Eminence in Shadow, and Power in Chainsaw Man.

How Heavy Are the Dumbbells You Lift? is a Japanese manga series written by Yabako Sandrovich and illustrated by MAAM. It has been serialized via Shogakukan's Ura Sunday website and MangaONE app since August 2016 and has been collected into nineteen tankōbon volumes as of September 2023. The manga is licensed in North America by Seven Seas Entertainment. A twelve-episode anime television series adaptation by Doga Kobo aired from July to September 2019.