exercise_tracker_api/app/Exercise.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Exercise extends Model
{
    /**
     * The name of the exercise
     * @var string
     */
    protected $name;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name'
    ];

    /**
     * @return string
     */
    public function getName(): string
    {
        return $this->name;
    }

    /**
     * @param string $name
     */
    public function setName(string $name): void
    {
        $this->name = $name;
    }
}