public async Task <Activation> CreateActivation(string exerciseId, Activation activationToCreate)
        {
            var exercise = await _exercisesRepository.ReadOneAsync(exerciseId);

            if (exercise == null)
            {
                return(null);
            }

            return(await _activationsRepository.CreateOneAsync(activationToCreate));
        }
        public async Task <Activation> CreateOneAsync(Activation muscleToCreate)
        {
            var createdExercise = await _musclesRepository.CreateOneAsync(muscleToCreate);

            return(createdExercise);
        }