Plank is a non-profit app made without advertising.

1. Offer your timer as many times as you like for the 30-day Plane Challenge.
2. Set the minutes and seconds to suit yourself first, then set how many seconds you want to increase.
3. Click Save Settings to save the settings at the top.
4. Click Delete Record to delete all records and settings.
5. When you complete a workout on each day, the count is filled.