private void Last()
        {
            //StopTimer();
            bool nextExe = workout.Finished;

            workout.Last();
            if (nextExe)
            {
                (NextCommand as Command).ChangeCanExecute();
                if (!saved)
                {
                    (SaveCommand as Command).ChangeCanExecute();
                }
            }
            if (workout.Current == 0)
            {
                (LastCommand as Command).ChangeCanExecute();
            }
            Update();
        }