How Heavy Are the Dumbbells You Lift?

Hibiki Sakura, a high school student and food enthusiast, becomes concerned about her weight and enrolls at Silverman Gym to get in shape. Though intimidated by the muscular crowd, she begins strength training after meeting the attractive trainer Machio Naruzo.

Machio discusses how exercise can lead to both weight and muscle gain while demonstrating a lat pulldown. Akemi emphasizes the benefits of dynamic stretching. Hibiki discovers more about Ayaka's family business.

Satomi Tachibana, a teacher at Hibiki's school, visits Silverman Gym to try to lose weight, while keeping a secret part of her life hidden from her students. Meanwhile, Ayaka joins Hibiki and Akemi for lunch and becomes suspicious about something unusual in Hibiki's lunchbox.

Hibiki and Akemi explore various ways to stay active and enjoy fitness sports during the summer break.

Hibiki undergoes intense training for the upcoming Sports Day event. Following her success there, she devises a scheme to secure the grand prize at the Silverman Gym raffle.

Hibiki enters the Silverman Gym arm wrestling tournament with the goal of winning 100,000 yen to buy a home theater system. She faces a strong challenge from Zina, a Russian competitor, who proves to be a valuable teacher for Hibiki and her friends.

Hibiki, Akemi, and Ayaka throw a welcome party for their new classmate Zina. Meanwhile, Tachibana-sensei faces the repercussions of Zina learning about her hidden hobby. The group later participates in an idol competition.

Two additional teachers from Hibiki's school enroll at Silverman Gym, increasing the tension between the two groups. During a field trip, Hibiki's class becomes lost, leading to a dangerous and uncertain situation. The group must find a way to survive and make it back safely.

A man from Machio's past arrives at Silverman Gym, disrupting the usual daily routine and stirring up unresolved tensions.

Hibiki and her friends attend a Christmas party at Silverman Gym, hoping to meet potential boyfriends among the male guests.

Hibiki and her friends visit a unique shrine to celebrate the New Year, face challenges while preparing for their first workout of the year, and decide to participate in an amateur talent show.

Hibiki and the Silverman Gym crew travel to the tropical island of Nikunoshima for spring break, where they participate in a local beauty pageant. The episode follows the competition as the group supports Hibiki in her bid to win the title of Miss Nikunoshima.