“Practicing” is the right word for this sentence. “Training” is usually used for something a person does to or for a person or thing in order to improve that person’s or thing’s abilities, and so the object of the verb “training” is a person, animal, or other object: Examples: I am training her to do the job. I am training my dog to sit on command. I am training Siri to recognize my voice. I am training myself how to read music.