With improvement of people's living standards, there are more and more concerns about the health. Currently, various fitness equipments have become available on the market, e.g., dumbbells, hand-muscle developers, treadmills, exercise bicycles and so on. Most people exercise just on such fitness equipment.
However, the “exercises” alone cannot deliver the best effect because the exercisers need an additional amount of oxygen during strenuous exercises. Particularly for those who suffer from some respiratory diseases, a supply of oxygen must be ensured.
Currently, however, most of the fitness equipments are not provided with an oxygen supplying device.