{
  "Upper Body": {
    "Chest": {
      "Pectoralis major": "Pecs",
      "Pectoralis minor": "Pecs"
    },
    "Back": {
      "Latissimus dorsi": "Lats",
      "Trapezius": "Traps",
      "Rhomboids": "Upper/mid-back muscles",
      "Erector spinae": "Spinal erectors",
      "Teres major": "Upper lats"
    },
    "Shoulders": {
      "Deltoids": "Delts",
      "Rotator cuff muscles": "Rotator cuff"
    },
    "Arms": {
      "Biceps brachii": "Biceps",
      "Brachialis": "Biceps’ under-muscle",
      "Triceps brachii": "Triceps",
      "Brachioradialis": "Forearm muscles",
      "Forearm flexors/extensors": "Forearm muscles"
    }
  },
  "Core": {
    "Abdominals": {
      "Rectus abdominis": "Abs",
      "Transverse abdominis": "Deep core abs",
      "External obliques": "Side abs",
      "Internal obliques": "Inner side abs"
    },
    "Lower Back": {
      "Quadratus lumborum": "QL/Lower back muscles",
      "Erector spinae": "Spinal erectors"
    }
  },
  "Lower Body": {
    "Legs": {
      "Quadriceps": "Quads",
      "Hamstrings": "Quads",
      "Gluteus maximus": "Glutes/Butt muscles",
      "Gluteus medius": "Glutes/Butt muscles",
      "Gluteus minimus": "Glutes/Butt muscles",
      "Adductors": "Adductors",
      "Abductors": "Adductors"
    },
    "Calves": {
      "Gastrocnemius": "Calves",
      "Soleus": "Calves"
    }
  }
}