public async Task <IEnumerable <Race> > GetOpenRacesForSkier(int id)
        {
            var openRaces = (await _raceService.GetRaces()).Where(race => race.Status == RaceStatus.Ready);

            return(openRaces.Where(race => _runService.GetAllRunsForRace(race, 1).Result.All(run => run.Skier.Id != id)));
        }