I am a coach for guiding people to lose weight.how can i get to meet people in excess weight to help them.?

i can help people to become very healthy and in the process if they are over weight they would lose weight &reach their Ideal weight and maintain it life long & if they are under weight they will gain weight and their immunity will also buildup.it is difficult to make people under stand importance of good health .if i ask them they say no I am fine.but obviously they r not healthy.