"progressive overload" meaning in English

{
  "forms": [
    {
      "form": "progressive overloads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "progressive overload (countable and uncountable, plural progressive overloads)",
      "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": "topical",
          "langcode": "en",
          "name": "Bodybuilding",
          "orig": "en:Bodybuilding",
          "parents": [
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A gradual increase of stress on a muscle as it grows in strength."
      ],
      "id": "en-progressive_overload-en-noun-QdGD4cbU",
      "links": [
        [
          "bodybuilding",
          "bodybuilding#Noun"
        ]
      ],
      "raw_glosses": [
        "(bodybuilding) A gradual increase of stress on a muscle as it grows in strength."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "bodybuilding",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "progressive overload"
}

{
  "forms": [
    {
      "form": "progressive overloads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "progressive overload (countable and uncountable, plural progressive overloads)",
      "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 uncountable nouns",
        "en:Bodybuilding"
      ],
      "glosses": [
        "A gradual increase of stress on a muscle as it grows in strength."
      ],
      "links": [
        [
          "bodybuilding",
          "bodybuilding#Noun"
        ]
      ],
      "raw_glosses": [
        "(bodybuilding) A gradual increase of stress on a muscle as it grows in strength."
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "bodybuilding",
        "hobbies",
        "lifestyle",
        "sports"
      ]
    }
  ],
  "word": "progressive overload"
}