Tabata Timer funktioniert nicht

Unlike specialized timers for time management, this HIIT interval timer doesn't limit you in any way and doesn't impose any productivity system. 
Numerous studies have shown that HIIT workouts burn more fat than regular training because they speed up metabolism within 24 hours after exercise.  Production of growth hormone that affects the intensity of fat burning, increased up to 450%.  This fitness timer will be useful for sprints, push-ups, jumping jacks, sit-ups, cycling, running, boxing, plank, weightlifting, martial arts, and other fitness activities. 
Whether it’s for your HIIT workouts, circuit training in the gym or at-home bodyweight training workouts, this exercise timer is for you. 
You can even use this circuit timer as a productivity timer to focus on your work tasks.  In this case, the next interval will be started only by clicking the next button. • Ability to filter your workouts by color, by text, collapse/expand them. • Ability to enter and display time in seconds or minutes. • Ability to lower the volume in your music player while playing the timer sounds (ducking). • Ability to change device’s orientation or to lock it.  Use this gym timer for training with weights, kettlebells, bodyweight exercises, crossfit, 7 minute workout, WOD, TRX, cardio exercises, stretching, spinning, calisthenics, tabata, boot camp circuit workout training, or any other high intensity interval training.  After installing this timer you need to press one button to start a tabata workout with classic settings. • Ability to set up prepare, work, rest, rest between sets, cool down time, number of cycles and sets. • Intervals can be configured individually.  You can set up sounds for each interval type, for last seconds, time left for work interval, etc. • Add descriptions to intervals that will be displayed on the timer screen and will be voiced. • Any interval can be started in repetitions mode.  Advanced users many options and the ability to fine-tune their workouts to fit their needs. 
Are you looking for a good sports interval timer app?  With this interval training timer you can create any interval workout with any sequence of intervals. • Sound and vibration.  Tabata Timer app is your new mate that will be with you on your training.  The subscription will be auto-renewed 24 hours prior to it running out and you can manage it from User Settings in iTunes after purchasing it, and you’ll also be able to cancel the auto-renewing subscription from there.  There are four different Premium version Subscriptions, 1 month subscription, 3 month subscription, 6 month subscription and 12 month subscription.  For extended features such as infinite number of workouts and app without ads, get the Premium version membership.  Should you choose to subscribe to Premium version, the purchase will be charged to your iTunes account.  Beginners will find a simple interface to start a workout in one click.  The app uses HealthKit for health and fitness purposes.  HealthKit helps the app to run in background. • Very intuitive interface.