Final answer:
Kretschmer examined the relationship between a person's physique and psychological disorders by studying how different body types may be more prone to certain mental health conditions.
Step-by-step explanation:
Kretschmer's research examined the relationship between a person's physique and psychological disorders. He explored the connection between body types and the development of certain mental health conditions. His work focused on the impact of physical attributes on psychological well-being. For example, he studied how different body types may be more prone to certain psychological disorders. This research can help us understand the complex relationship between physical and mental health.