Ow does spa facilities aid in treatment for mental health patiences

i would like research to be done on how the following facilities help patients to recover from mental health illnesses such as depression:
Swimming pool
Therapy room
Outdoor garden/space

The existing building will be made very spacious with open windows and glass walls.
The advantages of a rehab centre and its functions.
Facts and statistics on how these facilities help.

This should demonstrate expertise in engaging in sustained, in depth and relevant research from diverse sources.

Referencing Requirements: