Interval timer

The countdown timer is designed for organizing and conducting both sports training and individual sports interval exercises.
Works in the background. It supports the creation of an unlimited number of timers, setting the intervals for preparing and performing exercises, rest breaks, setting the number of repetitions. Countdown control is carried out on the device screen, using sound signals and notifications on the lock screen. It is possible to save the results of activities in the device memory. To analyze the results of training, the ability to aggregate data by months is implemented.