Supports Back Extension for 30 day challenge. Main function is to count Back Extension once a day.

Main Function
・Count Back Extension.
・Achievement days management.
・Notifications.
・Record Active Energy and Workouts to Apple Health.

How to use
・Put iPhone on floor.
・Tap screen.
・Keep your face close to iPhone screen. (Upper part) *
・Or count on iPhone screen tap.

Active Energy
・Ex. METs 3.5, Weight 50 kg, Time 10 min. (3.5 - 1) x 50 x (10 / 60) x 1.05 = 21.86 kcal.

Optional permission requests
・Apple Health: It is used to record data in Apple Health.
・Tracking: It is used to deliver personalized ads to you.
・Notifications: It is used to sending notifications.

Languages
・Japanese, English.

*Dynamic Island devices not supported