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From Tee-App (by Takuma Nakagawa):
A BackExtension-training app that you won't give up on. Train your back muscles every day with your iPhone. *Users who already have some ab strength may find the default settings for this app to be a bit low for their strength level. We encourage you to download and try the app to see if it gives you a good workout. If you feel you need something more intense, please consider purchasing the add-on pack. + icon Badge The app icon displays the number of repetitions you have remaining that day. The number is updated at midnight. Place the icon near other apps you regularly use to keep this friendly reminder onscreen. You'll never forget to keep aiming for a better workout. + Counter The camera sensor will count your repetitions. Train with confidence and let the app do the counting for you. It help to keep your accurate training. + twitter & facebook & LINE+ Reminder + Link with iPhone Calendar + Graph