三頭筋
anatomy
arm
biceps
body
cell
cells
chart
chest
collection
contraction
deltoid
design
element
energy
female
fiber
filaments
fitness
gain
graphic
gym
gymnastics
hand
human
icon
illustration
isolated
layers
male
man
muscle
muscular
organ
pectoral
protein
set
shoulder
sign
skeletal
sport
striated
strong
structure
system
tissue
workout