Product design question

Build something for physical wellness.

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Tests open-ended product design: picking a specific wellness problem and user rather than a vague fitness app.

Narrow 'physical wellness' to a specific problem, like sedentary remote workers building a movement habit.
Identify the pain: motivation and accountability drop off after the first week, not lack of content.
Decide the core mechanic: social accountability with friends, sharing a daily movement streak, using the social graph.
Prioritize habit-formation features, streaks and friend nudges, over a large content library in v1.
Design the flow: connect a wearable or manual log, share with an opt-in friend group, gentle nudges on missed days.
Define success as 4-week habit retention, the share still logging weekly, not one-time signups.

Narrows to a specific, well-known drop-off problem instead of a generic fitness app pitch.
Leverages the social graph for accountability instead of competing on content with fitness-specific apps.
Picks a retention-based success metric, the real measure of habit-building products.

Building a generic workout-video app that ignores the platform's actual strengths.
Measuring success by signups instead of sustained habit formation.

How would you keep this from feeling competitive or shaming for less active friends?
How would you integrate with existing wearables?
What would make a user churn after a few weeks?