Among all the new fitness fads and workout trends, the treadmill is an old faithful that never goes out of style. A 2021 study valued the global treadmill market size at US$3,797 million, and this figure is expected to reach US$5,946 million by 2030. However, some people get quickly bored of the treadmill. There must be so many sitting unused and gathering dust in people’s spare rooms, garages or even in gyms. But this is simply because the majority of