A surface that is too smooth can have insufficient friction for your feet to gain traction. A rocky surface, on the other hand, can be hard to navigate because of the uneven terrain.
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Pavers are used during construction when the cement is wet and they need the pavers to flatten out the surface so it is smooth for cars, bikes, or even people to walk on. They come in very handy when its time to get to places.
Excercise isn't necesarily the thing that will change a metabolism, which is actually very difficult if not impossible to do.
A flat surface generally refers to a horizontal surface and is referred to as the plane.
A 2000 metres walk.
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