Many people are not aware that there are actually treadmills that are manual. For them the only running machine that they ever saw was an electric treadmill, where the treadmill belt is moved by a motor. These are actually quite a new invention, and before that the manual machines were first invented to be used inside prisons – it made prison exercising quite easy, since they could be used indoors in a well secured area. Needless to say that there was no way someone could escape while jogging, since they could be strapped to the treadmill while running.
The manual models were powered by the runner themselves. This means that you would have to push back the belt with your feet to make it move, and once it was moving it would take quite a lot of strength to keep it running. The running motion in these machines is quite natural since you are pushing with your feet most of the time, as opposite to electric treadmill which has a motorised belt, so that you will only have to move your feet forward, and let the belt do the other work. It targets completely different muscles and that is why most of the experienced runners prefer running in the nature, compared to running indoors.
When you are running, you are targeting the most important muscle in your body, no matter where you are doing the workout. Your heart is the most important muscle, and for people who are looking to gain some health and fitness from running, using a treadmill is quite a fine choice, no matter if it is manual or electric treadmill. You are going to improve your cardiovascular health and your respiratory system no matter where you are doing the exercise.
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I have lately purchased a cheap treadmill, and I am questioning if long termuse will ruin my knees and if so is there anything that I can do to avoid that?