arcpy - Using ArcGIS Desktop to zoom to next selected feature?

How could I adapt the following code to enable me to zoom to each individual selected Geometry one after the other?

import arcpy
mxd = arcpy.mapping.MapDocument('CURRENT')
df = arcpy.mapping.ListDataFrames(mxd, "Layers") [0]
df.zoomToSelectedFeatures()
arcpy.RefreshActiveView()