Check WebMd for some of the issues a life coach might tackle. Life sciences have nothing to do with life coaches.
Think motivational speaker who assigns homework at rates of $300 to $1000 an hour. The homework? You clarify your goals, determine objectives, write steps to achieving, and the guru confronts you about your progress. This is clearly an "art" and not a science. It can last as long as you have money and success depends upon you doing the steps you have selected.
No training or certification in guidance counseling nor mental health. Some employment agencies offer some of the exercises such as a life coach provides in order to make clients work ready, for example.
List of life sciences