The Hashira Training conducted by the Hashira is a special training session that aims to improve all Demon Slayers' abilities and physical health. The training is split between the Hashira. First, the Sound Hashira, Tengen Uzui conducts training on basic stamina. Then, the Love Hashira, Mitsuri Kanroji, handles flexibility training and the Mist Hashira, Muichiro Tokito, deals with the quick movement training.
The Serpent Hashira, Obanai Iguro, then focuses on sword skill revision, followed up by the Wind Hashira, Sanemi Shinazugawa, who handles pounding training and finally the Stone Hashira, Gyomei Himejima, who trains muscle reinforcement. The Insect and Water Hashira, Shinobu Kocho and Giyu Tomioka do not take part in the training. However the latter then does take part in the session due to Tanjiro Kamado's motivation.
The majority of the Demon Slayers view the training session as an everlasting trip in hell, with the exception of Tanjiro Kamado and Inosuke Hashibira who see the session as a chance to improve themselves. As a general rule, Hashira must take part in each other's training sessions. It is considered a win-win situation for both the Hashira and the Demon Slayers as even the Hashira get to improve due to being constantly attacked by wave upon wave of juniors ranked lower than themselves.
- During the events of this arc, Tanjiro earned the nickname "Mommy", given by his fellow Demon Slayers.