Interval Timer funktioniert nicht

Running foreground, background or with device locked, this reliable app allows you specify an overall time as well as program High/Low intensity interval and rest time between sets. Produced by Polycents! -Interval Timer can use Apple Health to show heart rate in Apple Watch App. - Payment will be charged to your iTunes account at confirmation of purchase. - Your subscription will automatically renew unless auto-renew is disabled at least 24 hours before the end of the current subscription period. - Automatic renewals will be charged at the same price you were originally charged for the subscription. - Subscriptions can be managed by going to Account Settings on the App Store after purchase.  Whether your into cycling, running, lifting weights, exercise, workout, stretching, boxing, MMA or HIT, this interval timer will prove to be an invaluable asset to you.  We’re proud to introduce this handy little app that helps you keep track of your work and rest periods during workouts.  ***Free and reliable.  Perfect for use at home, at the track or in the gym.