A life coach is someone whose job involves helping people to improve their lives by doing challenging or worthwhile things.
life coachinguncountable noun
...life-coaching workshops.
life coach in British English
noun
a person whose job is to improve the quality of his or her client's life, by offering advice on professional and personal matters, such as career, health, personal relationships, etc
Examples of 'life coach' in a sentence
life coach
Also, think about being a life coach or personal trainer.