This gets thrown around so much and it's not true. As with a lot of the buzz phrases in the fitness industry it needs context for accuracy.
1 pound of cotton balls weighs the same as 1 pound of rocks....because they are both 1 pound. The difference is in density and volume. The rocks (muscle) are dense and solid whereas the cotton balls (fat) are light and soft. They weigh the same pound for pound but they indeed look very different.
What are some other topics you might want more information on?
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