Preview Health 21 days
Fasting Window Challenge
Ride your fast through metabolic stages.
Start a fast and watch a ring move through metabolic stages until your window closes. Skip it if fasting is not right for you. Mini-game coming soon.
See app availability
This challenge is in the app catalog but is not open yet.
Inside the challenge
What you will actually do
- 01 Start and track your fasting window
- 02 Unlock metabolic stages as hours pass
- 03 Mini-game in the works — coming soon
Read the safety guidance first
This challenge carries an elevated-risk label in the app catalog. Start conservatively, stop if you feel unwell, and get individual medical advice when a health condition or medication could change what is safe for you.
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Keep Fasting Window on your shortlist.
See app availability
This challenge is in the app catalog but is not open yet.