private void StartTimer()
{
_locationService.startGPSTraking();
IsActivated = true;
isInTicked = false;
ProgressAnimationLength = 10;
ProgressPracentage = 1;
CountdownTimer = TimerPickersViewModel[(int)UserExercizeMode].Time;
Time = CountdownTimer;
_timer = new CountDownTimer(Time);
_timer.Completed += OnCountdownTimerCompleted;
_timer.Ticked += OnCountdownTimerTicked;
_timer.Paused += OnCountdownTimerPaused;
_textToSpeach.SpeakNow("Lets go!");
_timer.Start();
}