public IActionResult TrainingPlanDetails(Guid trainingPlanId)
        {
            var trainingId   = _trainingPlanService.TakeTrainingPlanById(trainingPlanId);
            var planItemList = _trainingPlanService.ShowPlanItemsBelongingToTrainingPlan(trainingPlanId);

            var trainingPlanDetailsViewModel = new TrainingPlanDetailsViewModel()
            {
                PlanId           = trainingId.Id,
                TrainingPlanName = trainingId.TrainingPlanName,
                PlanItems        = planItemList
            };

            return(View(trainingPlanDetailsViewModel));
        }