Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Exercise has an important role not only in promoting general health but also in the prevention and treatment of various kinds of ailments, such as mood disorders (Agras, 1995) and constitutional hypotension (Duschek and Schandry, 2007).
Category: