public IActionResult Add(ExersiseViewModel exersiseModel)
        {
            if (!ModelState.IsValid)
            {
                return this.View(exersiseModel);
            }

            this.exersises.Create(
                exersiseModel.Name,
                exersiseModel.MuscleGroups,
                exersiseModel.ImageUrl);

            return this.RedirectToAction(nameof(this.All));
        }
        public IActionResult Edit(int id, ExersiseViewModel exersiseModel)
        {
            if (!ModelState.IsValid)
            {
                exersiseModel.IsEdit = true;
                return this.View(exersiseModel);
            }

            this.exersises.Edit(
                id,
                exersiseModel.Name, 
                exersiseModel.MuscleGroups, 
                exersiseModel.ImageUrl);

            return this.RedirectToAction(nameof(this.All));
        }