When it comes to fitness, a lot of people think they can achieve their goals on their own. But once they get started, they realize how challenging it actually is. Unless you know exactly what you are doing, know the best moves for your trouble areas, know what the best diet is for you, and can apply all of those things at once, it is going to be hard reaching your goals.
That is why personal trainers are so beneficial, especially to people who are new to fitness. Personal trainers can teach you the best workouts and exercises, they can show you the correct way to do them so you can avoid injury and get the most out of each move, and they can help you reach your goals faster than you could on your own.