There’s a reason movie stars and financial moguls use personal trainers: The benefits of working with a personal trainer is one of the fastest, easiest, most successful ways to improve your health and fitness. In fact, the benefit of personal training has proved so effective that it has spread well beyond the realm of the rich and famous. Today, people of all fitness, age and economic levels use personal trainers – and from all over the world – to help make lifestyle changes those people couldn’t achieve by themselves.