How to use the treadmill in the gym correctly? Do you jog first? Or did you run away from the beginning?

You'd better set it to 5 or 6 at first and walk for five minutes. Then start running. If you run, adjust the speed to around 10, and swing your arms as much as possible to improve the warm-up efficiency. If you are thin, it is recommended not to run for more than fifteen minutes. Usually run less to slow down in time to prevent cramps.