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...
You have more muscles in your lower body
than in your upper body!
لديّ عضلات أكثر في جسدي السّفلي
!ممّا لديّ في جسدي العلويّ
Denn im Unterleib sind
die meisten Muskeln!
La parte inferior del cuerpo tiene
más músculos que la superior.
Hay más músculos
en la parte inferior del cuerpo.
On a beaucoup plus de muscles
dans le bas du corps.
La parte inferiore del corpo 
ha molti più muscoli di quella superiore!
Você tem mais músculos na parte 
inferior do que superior do corpo!
Упирайся, ведь мышцы ног
куда сильнее!