Descartes found it impossible to doubt his own existence. The reason for this was that he felt that thoughts had to come from himself.
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That he existed.
One of Descartes simple but important contributions to the field of mathematics is his notation, which made exponents into a superscript after the root. He also came up with the formula for reflection and refraction and the Cartesian plane
Descartes was a very philosophical person. In fact he's the father of modern philosophy He thought the world on 3 axes, he had to do this while he was trying to solve the riddle of pappus. But to be more specific he invented the coordinate system while he was sleeping with one oven at he's side and had 3 dreams. the answer you're looking for, is that "Descartes dreamt the coordinate system, then he did it reality on a compendium of one of he's 3 books of philosopy"
Excercise isn't necesarily the thing that will change a metabolism, which is actually very difficult if not impossible to do.