Jinzō Konchū Kabuto Borg VxV

Jinzō Konchū Kabuto Borg VxV is an anime series based on the Kabuto Borg toys developed by Takara Tomy. It aired on Animax from October 2006 to October of the next year. It is also known in some groups for its nonsensical parts. Borg battles are a game where people pit their kabuto borgs, which are small, beetle-shaped machines, against each other. Ryūsei Amanogawa is an enthusiast of these battles, and he and his friends Katsuji and Ken face many opponents.

Muscle Shonentai! Sweet Muscular Pane!
Season 1, Episode 23

Barbara offers to train Ryūsei, Katsuji, Ken, who are trying to get win an upcoming tournament. She makes them train hard and drink lots of protein milk, however her program is far too effective as the boys bulk up far too much, scaring away girls and making them worse at Borg battles.

They return to Barbara, who seems confused at the idea of them having "too much muscle". She clarifies that she thought they had wanted to train for a bodybuilding tournament, not a Borg battle one. They demand she helps them lose their muscles, but she gets angry, still not understanding why they'd want to lose their muscles.

She shouts and starts vigorously pumping up on a pulldown machine, so much so that it creates smoke around her. She offers that, if Ryūsei beats her in a Borg battle, she will help them create a weight loss program. But if she wins they have to enter the bodybuilding tournament.

Once they accept, the smoke clears to reveal Barbara has grown massive muscles. She also admits that she's actually quite skilled in Borg battles, with the most wins in California, and that her figure is much more suited for Borg battles unlike Ryūsei's. Once the match starts, it seems like Ryūsei is going to win, as Barbara shouts "Pump up, creamy!". Barabara's bug falls and she admits defeat before fainting.