The series of shorts is based on Wada's "My Exercise" game about a curious boy who exercises with a dog. The boy encounters various creatures and tries to emulate them, with the valiant help of his dog. 
 
(Source: Anime News Network)

A chubby boy does sit-ups with the help of his dog. 
 
This short film, the first produced as part of Atsushi Wada's Ikimono-san animation series project, was later expanded and released as a video game developed by Playables.

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