Final answer:
The initial step in EMST involves learning through praxis, a method where the patient follows verbal instructions to perform tasks, using sensory feedback without demonstrations.
Step-by-step explanation:
The first step in training with the Expiratory Muscle Strength Trainer (EMST) appears to involve understanding and applying a specific problem-solving strategy. Given the context, it seems likely that the first step would be learning praxis, which is a practical exercise that helps a patient perform a task based solely on verbal instructions without any physical demonstration. This would mean that the patient needs to understand the instructions given by the health professional, and then convert these into movement while using sensory feedback to perform the action correctly.