"chest day" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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        {
          "word": "list in leg day"
        }
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        {
          "ref": "2000, Jourdan Zayles, The Complete Idiot's Guide to Working Out at Home, Penguin, →ISBN, page 133:",
          "text": "[…] chest day shouldn't be next to shoulder day, and back day shouldn't be next to biceps day, unless you're doing a push / pull split. Simply put, no rest means no results. Here are a few split options to get you started : Day 1[…]",
          "type": "quote"
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          "ref": "2007 09, Dr Suzanne Osborne, Suzanne Osborne, Pure Life: The Pura Vida Journey, iUniverse, →ISBN, page 178:",
          "text": "[If you do] chest day on Monday, it throws off your entire schedule. With a four-day cycle, if you must miss a day, you simply pick up on the next day of your routine and carry on. For example, regardless of what day of the week it is, on day 1 of[…]",
          "type": "quote"
        },
        {
          "ref": "2023 February 20, Jim Stoppani, Jim Stoppani's Encyclopedia of Muscle & Strength, Human Kinetics, →ISBN, page 263:",
          "text": "[On] chest day, all you do is bench press. Weight increases and therefore repetitions decrease every three weeks until you reach the last week when you max out with your new record weight. Allow three to five minutes of rest between sets on[…]",
          "type": "quote"
        }
      ],
      "glosses": [
        "A day dedicated to chest exercises."
      ],
      "id": "en-chest_day-en-noun-VD06F798",
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          "exercise",
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  "word": "chest day"
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        {
          "ref": "2000, Jourdan Zayles, The Complete Idiot's Guide to Working Out at Home, Penguin, →ISBN, page 133:",
          "text": "[…] chest day shouldn't be next to shoulder day, and back day shouldn't be next to biceps day, unless you're doing a push / pull split. Simply put, no rest means no results. Here are a few split options to get you started : Day 1[…]",
          "type": "quote"
        },
        {
          "ref": "2007 09, Dr Suzanne Osborne, Suzanne Osborne, Pure Life: The Pura Vida Journey, iUniverse, →ISBN, page 178:",
          "text": "[If you do] chest day on Monday, it throws off your entire schedule. With a four-day cycle, if you must miss a day, you simply pick up on the next day of your routine and carry on. For example, regardless of what day of the week it is, on day 1 of[…]",
          "type": "quote"
        },
        {
          "ref": "2023 February 20, Jim Stoppani, Jim Stoppani's Encyclopedia of Muscle & Strength, Human Kinetics, →ISBN, page 263:",
          "text": "[On] chest day, all you do is bench press. Weight increases and therefore repetitions decrease every three weeks until you reach the last week when you max out with your new record weight. Allow three to five minutes of rest between sets on[…]",
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        }
      ],
      "glosses": [
        "A day dedicated to chest exercises."
      ],
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