How do you know if you have good genes for bodybuilding?

Can you answer justinyii’s question about Bodybuilding?:

Or what im trying to say is that, how do you know if you got good genes for muscle if that makes sense. BEcause me and my brother use to workout in the gym for maybe 4 times a week for like 3 months without really a schedule just lifting some weights here and there without any knowledge of bodybuilding. And right now we are in pretty good shape.

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