I'm a runner and very skinny, but started lifting weights and now gaining weight fast, why?

or:Im a runner and very skinny, but started lifting weights and now gaining weight fast, why?or:Weight lifting will increase weight. It's a good wei

or:I'm a runner and very skinny, but started lifting weights and now gaining weight fast, why?

or:Weight lifting will increase weight. It's a good weight gain bc it's muscle your building.

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