Hi guys! I have a question about gaining weight?

Sooooo I've been asked by some family members, friends, etc that it may be a good idea for me to gain some weight! (I'm about 10 pounds less since my profile picture was taken). I'm a bit apprehensive to gain some weight because I don't want to lose my "flat stomach". Is there any advice anyone would could give me? Thank you!
Hi guys! I have a question about gaining weight?
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