I want to gain weight. Should I go for dance or gym?

Hi, I am 25 and confused, I like to dance as well as want to increase my weight so I have to hit the gym for muscular gain.
But the thing is, is there any way?
What should I do?
Dance or gym?
I don't want to google it because it sucked getting everything without a genuine reply.
My weight: 56.5kg age 24-25
I want to gain weight. Should I go for dance or gym?
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