Large Struct Array will not compile

import Foundation
import UIKit

struct ExerciseTypes {

    var title: String?
    var description: String?
    var imageIcon: UIImage?

    init(index: Int) {

let exerciseType = ExercisesModel().exerciseType
        let exerciseDictionary = exerciseType(index)
        title = exerciseDictionary["title"]!
        description = exerciseDictionary["description"]!
        let exImageIcon: String = exerciseDictionary["imageIcon"]!
        imageIcon = UIImage(named: exImageIcon)
        }
}

struct ExercisesModel {

    let exerciseType = [
        ["title": "Exercise Type 1",
            "description": "Exercise Type 1 Description",
            "imageIcon": "s",
        ],

        ["title": "Exercise Type 2",
            "description": "Exercise Type 2 Description",
            "imageIcon": "f"],

        ["title": "Exercise Type 3",
            "description": "Exercise Type 3 Description",
            "imageIcon": "b"],

        ["title": "Exercise Type 4",
            "description": "Exercise Type 4 Description",
            "imageIcon": "a"],
    ]
}