"Copenhagen plank" meaning in English

{
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        "2": "Nordic hamstring curls",
        "3": "Nordic hamstring curls"
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  ],
  "etymology_text": "Named after the city, due to having spread from a couple of Danish or at least Scandinavian coaches, in analogy to Nordic hamstring curls.",
  "forms": [
    {
      "form": "Copenhagen planks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "Copenhagen plank (plural Copenhagen planks)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Exercise",
          "orig": "en:Exercise",
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            "Human activity",
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            "Human",
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            "Fundamental"
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      ],
      "glosses": [
        "An exercise where one of a person's legs is put on an elevated surface and the upper body is on the forearm nearest to the ground."
      ],
      "id": "en-Copenhagen_plank-en-noun-3uF33We0",
      "links": [
        [
          "exercise",
          "exercise"
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        [
          "person",
          "person"
        ],
        [
          "legs",
          "legs"
        ],
        [
          "elevated",
          "elevated"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "forearm",
          "forearm"
        ]
      ],
      "synonyms": [
        {
          "word": "Copenhagen side plank"
        },
        {
          "word": "Copenhagen hold"
        },
        {
          "word": "Copenhagen hip adduction exercise"
        },
        {
          "word": "adductor plank"
        },
        {
          "word": "adductor side plank"
        }
      ]
    }
  ],
  "word": "Copenhagen plank"
}

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  ],
  "etymology_text": "Named after the city, due to having spread from a couple of Danish or at least Scandinavian coaches, in analogy to Nordic hamstring curls.",
  "forms": [
    {
      "form": "Copenhagen planks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "Copenhagen plank (plural Copenhagen planks)",
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  "lang_code": "en",
  "pos": "noun",
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        "An exercise where one of a person's legs is put on an elevated surface and the upper body is on the forearm nearest to the ground."
      ],
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          "exercise",
          "exercise"
        ],
        [
          "person",
          "person"
        ],
        [
          "legs",
          "legs"
        ],
        [
          "elevated",
          "elevated"
        ],
        [
          "surface",
          "surface"
        ],
        [
          "forearm",
          "forearm"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Copenhagen side plank"
    },
    {
      "word": "Copenhagen hold"
    },
    {
      "word": "Copenhagen hip adduction exercise"
    },
    {
      "word": "adductor plank"
    },
    {
      "word": "adductor side plank"
    }
  ],
  "word": "Copenhagen plank"
}