"free weight" meaning in English

{
  "forms": [
    {
      "form": "free weights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "free weight (plural free weights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Exercise equipment",
          "orig": "en:Exercise equipment",
          "parents": [
            "Exercise",
            "Tools",
            "Sports",
            "Technology",
            "Human activity",
            "All topics",
            "Human behaviour",
            "Fundamental",
            "Human"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Free weights hit the stabilizing muscles harder.",
          "type": "example"
        }
      ],
      "glosses": [
        "An object (such as a barbell or kettlebell) used for strength training that can be moved without mechanical constraint, as opposed to an exercise machine."
      ],
      "id": "en-free_weight-en-noun-a2bBOFpQ",
      "links": [
        [
          "barbell",
          "barbell"
        ],
        [
          "kettlebell",
          "kettlebell"
        ],
        [
          "strength training",
          "strength training"
        ],
        [
          "exercise machine",
          "exercise machine"
        ]
      ]
    }
  ],
  "word": "free weight"
}

{
  "forms": [
    {
      "form": "free weights",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "free weight (plural free weights)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Exercise equipment"
      ],
      "examples": [
        {
          "text": "Free weights hit the stabilizing muscles harder.",
          "type": "example"
        }
      ],
      "glosses": [
        "An object (such as a barbell or kettlebell) used for strength training that can be moved without mechanical constraint, as opposed to an exercise machine."
      ],
      "links": [
        [
          "barbell",
          "barbell"
        ],
        [
          "kettlebell",
          "kettlebell"
        ],
        [
          "strength training",
          "strength training"
        ],
        [
          "exercise machine",
          "exercise machine"
        ]
      ]
    }
  ],
  "word": "free weight"
}