She's a real-life gymnast, who competed in the 2005 World Rhythmic Gymnastics Championships. She's also the star of the below video, which is technically titled "Mariko Takahashi's Fitness Video For Being Appraised as an 'Ex-fat Girl,'" but is more popularly known in the world of memery as "Poodle Fitness." Needless to say, it's way weird.
From Wikipedia: "[Director] Nagi Noda, in her artist's statement, explained that she arrived at the poodle concept after noticing that the dogs' hair cuts resembled muscles. She believed that this concept would help her video appeal to people of all ages." Of course!
[ Source: PCL LinkDump ]