As Jumpei and Luou get used to the summer school class, they become involved in a friendly competition with some other boys from the class.
then your muscles won't build evenly,
،فإنّ العضلات لا تُبنى بشكل متكافئ
entwickeln sich die Muskeln
ungleichmäßig
ganas músculos que no necesitas
ganas músculos que no tocan
c’est risquer de gagner trop de muscle
et de bloquer ta croissance.
potresti sviluppare muscolatura 
in modo non equilibrato,
os músculos não crescem igualmente
мышцы будут плохо сбалансированы,