Treadmill is a kind of fitness equipment, and it is one of the common equipment in gym or family sports. Generally, it needs to be connected to the power supply to work normally. The main reasons for connecting the power supply are as follows:

1. Make the electronic controller of the treadmill work normally: The treadmill controls the speed and inclination of the motor through the electronic controller, and the controller can work normally when the power is connected.

2. Ensure the stability of the treadmill: The inertia force generated by the treadmill during operation is very large, and it needs a stable foundation to support the movement. Connecting the power supply can make the motor run and generate enough power to make the treadmill more stable.

3. Meet different sports needs: Some treadmills can adjust the speed and slope, and need to be connected to the power supply to adjust the corresponding parameters to make the exercise more diversified.

4. Help users calculate exercise data: Most treadmills are equipped with electronic timers and data display screens, which can record users' exercise time, speed, mileage and other data. Connecting the power supply can make these functions work normally.

In short, connecting the power supply to the treadmill can make it work normally, ensure stability, meet different sports needs, and also help users record sports data and make sports more scientific. So when using the treadmill, be sure to follow the instructions and turn on the power, which will make your exercise smoother and safer.