Hibiki enjoys the finer things in life, and when it comes to food, she's downright indulgent. When it becomes clear she's getting chubby, she decides to better herself by joining a gym.
In her attempt to find a casual gym, she meets Akemi - a comrade-in-arms. Little does Hibiki know, Akemi has an ulterior motive.

What will this wonderful world of fitness have in store for Hibiki?

Hibiki is a teenage girl who loves to eat, but when she notices her waistline expanding, she decides to check out the local gym. The gym is full of buff dudes…and Akemi, the student council president?! When Akemi tries to convince Hibiki to take up weight training, Hibiki resists–until she meets pretty boy trainer Machio. Now, Hibiki is willing to do whatever it takes to get fit!
 (Source: Seven Seas Entertainment)
 Note: This manga is set in the same universe as Kengan Ashura and ST✰R: Strike it Rich.

Since the Edo periods of Japan, gladiator arenas exist in certain areas. In these arenas, wealthy business owners and merchants hire gladiators to fight in unarmed combat where winner takes all. Toki Taouma, nicknamed "Ashura", joins these arenas and devastates his opponents. His spectacular ability to crush his enemies catches the attention of the big business owners, including the Nogi Group chairman, Nogi Hideki. 

(Source: MangaHelpers)

Specials included on the Dumbbell Nan Kilo Moteru? DVD/BD volumes 3 and 4, respectively. Also included on Funimation's US Blu-Ray release. They are completely new extensive versions of exercise sessions normally seen at the end of each TV anime episode.

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