The purpose of a treadmill is to help one exercise while having the convenience of running indoors, staying in one spot and not going in circles.
Unfortunately, the math just doesn’t work out in favour of the exerciser.
According to physics,
- is the amount of work done on an object, in joules
- is the [net] force on an object, in newtons
- is the distance that the object has moved, in metres
For you to burn calories, .
On a treadmill, you are not covering any distance, so no matter how much force is applied, there is no work done because .
Even if you make the argument that we’re travelling millions of metres a second because the Earth, the Sun, and the Milky Way Galaxy are all moving, one could argue that while you’re on a treadmill, the net force on you is negligible. There is no work done because .
In both cases, , therefore no calories are burned, and yet despite all this, some people still find this an effective way to exercise. I don’t understand.