How Heavy Are the Dumbbells You Lift? (ダンベル何キロ持てる？, Danberu Nan-Kiro Moteru?) 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 2016, and licensed in North America by Seven Seas Entertainment. An anime adaptation by Doga Kobo premiered on July 3, 2019.
Hibiki Sakura is an average high school girl with a voracious appetite. Noticing her clothes tightening in lieu of her slowly expanding waistline she decides to look into enrolling in the nearby gym. There she runs into another schoolmate, Akemi Soryuin, the academy's honor student and student council president.
Akemi tries to get Hibiki to enroll in the gym despite its high ratio of macho men (especially Akemi's muscle-fetish). Thankfully a handsome trainer named Machio appears and unknowingly convinces her to enroll and start her quest to a great body.