During the boulder training, Tanjiro is able to move the boulder thanks to Genya's training advice. However, Tanjiro has used all of his power to do so and he is saved by Himejima after he collapses. Himejima, moved by Tanjiro's genuineness, begins to talk to him about his past...
Well, it's because I can't use
breathing techniques.
.هذا لأنّي لا أستطيع استعمال تقنيات التّنفّس
Bem, é porque eu não consigo
 usar técnicas de respiração.
Ну так я не умею
дыханием пользоваться.