You can equip yourself with some simple exercise equipment at home, such as treadmills, yoga mats and rollers, but it is often overlooked that the indoor air quality, including most gyms, is the same now, so why do many people go outdoors to exercise? In crowded and unsmooth places, you will feel dizzy for a long time, which is already a sign of lack of oxygen, so it is best to install a fresh air system at home to discharge indoor dirty air and transport fresh air.