Design a feature that helps users build a habit inside a wellness app.

Model answerHabit formation needs three things: a trigger, a routine, and a reward. I'd design a daily check-in flow that is contextual (notification at the user's chosen time), minimal (one tap to log), and satisfying (streak visualization + brief positive feedback). The reward loop matters as much as the action. I'd measure 7-day and 30-day streak retention as leading indicators of long-term habit formation.