英文關鍵字
foot
health
male
feet
snow
winter
freeze
step
hardening
walk
adaptation
barefoot
man
breathe
cardiovascular
circulation
endurance
fitness
heat
human
immunity
oxygen
refreshing
strength
temperature
training
veins
chilly
clarity
contrast
cooling
legs
body
caucasian
stamina
white
alone
weather
bare
wellness
extreme
going
wintry
skin