# How much weight do you gain when you go running?

According to the theory of relativity, mass increases as an object increases speed. so you are getting fatter when you run....

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• 2 years ago

You don’t gain weight.

• goring
Lv 6
2 years ago

Einstein mass increase equation has been abandoned already. The reason is that it bucks the 2nd law of thermodynamics.

mass radiation is received by our body from the sun ;however when we run we are really a heat engine doing work.

Hence in order to do work during our motion we are traveling a distance and we are therefore losing mass.This mass loss process is called entropy which is mass x C^2.

• 2 years ago

In your own frame of reference you are not moving so you gain no mass.

However energy has mass. When you exert energy then you radiate mass outwards.

In fact if you use up too much energy then all your mass has been converted to energy and you cease to exist.

Although for some people it might take billions of years to convert ALL of their mass to energy.

• Lv 7
2 years agoReport

R

• Kenny
Lv 7
2 years ago

You have to keep running while you're on the scale .

• 2 years ago

Lets do some math. Usain Bolt could do 12.5 meters per second (in a short burst, not the whole 100 meters). At that speed, the "mass increase" is about a factor of 8.7 x 10^-16. For a 100 kg person (a bit on the large side), that's about 0.087 nanograms, or the mass of one human red blood cell, or one tiny tiny drop of sweat.

Of course, this increase is lost as soon as you stop running.

• Anonymous
2 years ago

No you burn fat and develop muscle

• dogsafire
Lv 7
2 years agoReport

He wants to know about the relativistic effect

• Anonymous
2 years ago

Unless you're capable of running close to the speed of light; the mass increase will be so small as to be insignificant. For example, it would be millions of times less than the mass of the carbon dioxide in your lungs.