Recent psychological literature strongly suggests that couples will be more successful in marriage if they share common hobbies rather than cultivating activities outside of the relationship.

1.rather than cultivating activities outside of the relationship
2.rather than cultivate activities outside of the relationship
3.rather than cultivate activities that do not involve their partners
4.instead of cultivating distinct activities
5.instead of cultivating activities outside of the relationship

OA [spoiler]Din't have it in the source[/spoiler]