[
  {
    "major_group": "Upper Body",
    "group_name": "Chest",
    "muscles": [
      "Pectoralis major",
      "Pectoralis minor"
    ]
  },
  {
    "major_group": "Upper Body",
    "group_name": "Back",
    "muscles": [
      "Latissimus dorsi",
      "Trapezius",
      "Rhomboids",
      "Erector spinae",
      "Teres major"
    ]
  },
  {
    "major_group": "Upper Body",
    "group_name": "Shoulders",
    "muscles": [
      "Deltoids",
      "Rotator cuff muscles"
    ]
  },
  {
    "major_group": "Upper Body",
    "group_name": "Arms",
    "muscles": [
      "Biceps brachii",
      "Brachialis",
      "Triceps brachii",
      "Brachioradialis",
      "Forearm flexors/extensors"
    ]
  },
  {
    "major_group": "Core",
    "group_name": "Abdominals",
    "muscles": [
      "Rectus abdominis",
      "Transverse abdominis",
      "External obliques",
      "Internal obliques"
    ]
  },
  {
    "major_group": "Core",
    "group_name": "Lower Back",
    "muscles": [
      "Quadratus lumborum",
      "Erector spinae"
    ]
  },
  {
    "major_group": "Lower Body",
    "group_name": "Legs",
    "muscles": [
      "Quadriceps",
      "Hamstrings",
      "Gluteus maximus",
      "Gluteus medius",
      "Gluteus minimus",
      "Adductors",
      "Abductors"
    ]
  },
  {
    "major_group": "Lower Body",
    "group_name": "Calves",
    "muscles": [
      "Gastrocnemius",
      "Soleus"
    ]
  }
]