Who knows a good workout plan for gaining muscle mass?

Anonymous
Preferably what workout plan do you guys use? How long do you stay in the gym for? Something that will help me see progress in 3 months
Updates:
4 mo
Is it possible to still gain muscle even if u dont eat too much? I go to high school, dont have a job so I can't buy my own food on the whim
4 mo
I'm reading everything
Who knows a good workout plan for gaining muscle mass?
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