Danberu Nan-Kilo Moteru?

Description
When a friend cruelly calls Hibiki fat it's like a knife stabbed into her heart. The high school girl loves to eat but decides to go on a diet to be absolutely thin by summer vacation, but she doesn't know how to exercise properly on her own. Hibiki finds herself in front of a training gym and joins. Once there, she meets her beautiful and charismatic student council president Akemi Sōryūin and steps into the intense yet enjoyable world of weight-training. (from manga)

Alternative titles