跑步機不插電也能動的嗎？

Yes， non-electric treadmills exist and can provide a great cardio workout just like their electric counterparts. These treadmills are powered solely by the user's body weight and movement， making them environmentally friendly and cost-effective options for exercising at home.

Non-electric treadmills usually come in two forms: manual and curved. Manual treadmills are operated through the user's movement as they push the belt forward with each step. Some models even have adjustable inclines to increase the intensity of the workout. Manual treadmills are ideal for walkers and joggers who want a low-impact workout that's easy on the joints. Curved treadmills， on the other hand， are designed to mimic the natural movement of running outdoors. The curved shape of the running surface means that the user has to exert more effort to maintain their speed and creates a more challenging workout.

One of the primary advantages of non-electric treadmills is that they are more affordable than electric models. They also tend to be more compact and easier to store， making them perfect for people with limited space. They also do not require an electrical outlet， making them perfect for outdoor workouts or power failure situations.

However， just like with any workout equipment， there are also some downsides to non-electric treadmills. Some people might find them more challenging to use， and they can put more strain on the joints， especially if used for long periods. The lack of a digital display can also make it harder to monitor progress， distance， and other metrics that electric treadmills provide， but if you don't care about these things， then a non-electric treadmill could be a great option.

Overall， non-electric treadmills can be an excellent choice for people who want a low-impact， eco-friendly， and cost-effective workout. With regular use， they can help improve cardiovascular endurance， stamina， and overall fitness levels.