How to start workout as a weak person?

I never workout before. Even regularly walking. So my body just got weaker. But now I decided to learn boxing so what should I start with? Doing only warm ups for a month? Jumping rope? Or right after I warm up starting shadowboxing basics? What am I supposed to do?


Edit: I decided that again months ago but after a few of climbing and squat move my upper leg's front muscles are just DİED I couldn't even sit for shitting... Literally... What was painfully weeks :d
How to start workout as a weak person?
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