Air springs are an industrial fitting capable of support, cushion, brake, height adjustment and angle adjustment functions. Compared to an ordinary mechanical spring, the gas springs have an easier control stroke, a relatively slow speed and are safety to use, making them a popular choice in treadmills, particularly in the folding components. When the treadmill is folded, the air springs will slowly drop, or even stop during the descent, ensuring the treadmill will not instantly fold and damage the equipment. In addition, the air spring features an outstanding load bearing capacity. When closed, a single air spring can bear up to 1,000kg, and when open, a single air spring can withstand up to 30kg. Therefore, the air springs used in our home treadmills ensure the equipment runs smoothly and safely.