Fitness problems how to gain weight for a thin tall girl?

Anonymous
I'm a female (15 years old) 5.5 1/2 tall & weight 106.5 I am underweight :.( I never gain weight it's so hard it's my fast metabolism I hate it! :/ but how to gain weight the healthy way I know I need to Excersize but what can I eat?
Fitness problems how to gain weight for a thin tall girl?
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