三頭筋
abdominal
abdominal muscle
abs
adult
aerobics
athlete
bicep
biceps
body building
body building exercises
body conscious
bodybuilder
bodybuilding
caucasian
dark
dramatic lighting
fit
flexing muscles
gym
health and fitness
health club
healthy eating
healthy lifestyle
human muscle
indoors
lifestyles
low key
male
man
men
muscular build
sport
sports and fitness
sports clothing
sports training
strength
strong
symmetry
the human body
waist
weight training
young man