{
  "$schema": "http://json-schema.org/draft-04/schema#",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "pattern": "^[0-9a-zA-Z_-]+$"
    },
    "name": {
      "type": "string"
    },
    "force": {
      "type": [ "string", "null" ],
      "enum": [
        null,
        "static",
        "pull",
        "push"
      ]
    },
    "level": {
      "type": "string",
      "enum": [
        "beginner",
        "intermediate",
        "expert"
      ]
    },
    "mechanic": {
      "type": [ "string", "null" ],
      "enum": [
        "isolation",
        "compound",
        null
      ]
    },
    "equipment": {
      "type": [ "string", "null" ],
      "enum": [
        null,
        "medicine ball",
        "dumbbell",
        "body only",
        "bands",
        "kettlebells",
        "foam roll",
        "cable",
        "machine",
        "barbell",
        "exercise ball",
        "e-z curl bar",
        "other"
      ]
    },
    "primaryMuscles": {
      "type": "array",
      "items": [
        {
          "type": "string",
          "enum": [
            "abdominals",
            "abductors",
            "adductors",
            "biceps",
            "calves",
            "chest",
            "forearms",
            "glutes",
            "hamstrings",
            "lats",
            "lower back",
            "middle back",
            "neck",
            "quadriceps",
            "shoulders",
            "traps",
            "triceps"
          ]
        }
      ]
    },
    "secondaryMuscles": {
      "type": "array",
      "items": [
        {
          "type": "string",
          "enum": [
            "abdominals",
            "abductors",
            "adductors",
            "biceps",
            "calves",
            "chest",
            "forearms",
            "glutes",
            "hamstrings",
            "lats",
            "lower back",
            "middle back",
            "neck",
            "quadriceps",
            "shoulders",
            "traps",
            "triceps"
          ]
        }
      ]
    },
    "instructions": {
      "type": "array",
      "items": [
        {
          "type": "string"
        }
      ]
    },
    "category": {
      "type": "string",
      "enum": [
        "powerlifting",
        "strength",
        "stretching",
        "cardio",
        "olympic weightlifting",
        "strongman",
        "plyometrics"
      ]
    },
    "images": {
      "type": "array",
      "items": [
        {
          "type": "string"
        }
      ]
    }
  },
  "required": [
    "id",
    "name",
    "level",
    "mechanic",
    "equipment",
    "primaryMuscles",
    "secondaryMuscles",
    "instructions",
    "category",
    "images"
  ]
}