private IEnumerable<ExerciseInstance> GetExerciseInstances(long exerciseId)
{
var exerciseInstanceService = new ExerciseInstanceService(new ExerciseInstanceRepository(), new ExerciseRepository());
List<ExerciseInstance> allExerciseInstances = exerciseInstanceService.GetByDates(DateTime.MinValue, DateTime.MaxValue);
List<ExerciseInstance> exerciseInstances = allExerciseInstances.Where(item => item.Exercise.Id == exerciseId).ToList();
return exerciseInstances;
}
