英文關鍵字
belt
drive
pressure
roller
changing
expertise
working
sport
machine
healthy
workout
lifestyle
health
power
exercise
activity
gym
equipment
active
fitness
fit
room
stationary
cardio
people
indoors
muscle
cycle
training
concept
bicycle
gear
wheel
man
mechanical
mechanic
repair
maintenance
adjust
tool
pedal
cyclist
repairman
service
business
biking
workshop
job
alignment
adult
position
bike
removes
loosen
tensioner
nuts
close-up