A minimum of 20% of the entire subdivision must be retained in open areas and deeded for the common use of residents of the development. The common and developed open space area shall be planned as an integral part of the development providing access to and benefits for all residents of the development. Of the 20%, at least half must be deemed to be active open spaces, such as playgrounds, jogging paths, picnic areas, soccer fields, etc., as determined by the Planning and Zoning Commission. (Example: if a wooded area with a trail is included in the open space plan, only the trail itself would be considered active open space.)