If a client was not losing weight, but losing inches, how would you keep the client motivated to stick with you?

Reinforce what they have done rather than what they have not done
I am also curious about the way this question was phrased, it’s not about sticking with you , it’s about their commitment to their goals and themselves.
Clients stay with you as long as they are getting value from your services
Stay on track with goal setting and re assessments