In careers where you are required to work with a variety of people, interpersonal skills are necessary. Without interpersonal skills you will not be able to effectively communicate with bosses, co-workers, employees, or customers. A personal trainer career is no different. As personal trainer will work with a large variety of people, which may include injured patients, women looking to maintain their figure, men and women looking to get at a healthier weight, or just someone looking for some advice on their exercise regimen and someone to …