Lemme clarify.
We are talking about the mass and not the 'weight' of the person.
Weight does vary based on 'g' but the mass doesnt. The point made above is that the mass of the person is reduced during the course of the race.
It was mentioned as weight and not mass because of the fact that mass is commonly referred to as weight.
To sumup the mass of the person after the race will be lesser that his/her mass before.
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