"newbie gains" meaning in English

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  "lang_code": "en",
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          "orig": "en:Bodybuilding",
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          "ref": "2024 September 13 [2023 March 31], Shane Duquette and Marco Walker-Ng, “The Newbie Gains Guide for Skinny Guys”, in Bony to Beastly:",
          "text": "If you’re starting off skinny, you can probably get newbie gains for several months.",
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        "Rapid increases in muscle mass when a person begins training."
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        "(bodybuilding, slang) Rapid increases in muscle mass when a person begins training."
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        "bodybuilding",
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  "word": "newbie gains"
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          "ref": "2024 September 13 [2023 March 31], Shane Duquette and Marco Walker-Ng, “The Newbie Gains Guide for Skinny Guys”, in Bony to Beastly:",
          "text": "If you’re starting off skinny, you can probably get newbie gains for several months.",
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      ],
      "glosses": [
        "Rapid increases in muscle mass when a person begins training."
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        "(bodybuilding, slang) Rapid increases in muscle mass when a person begins training."
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