Extended is related to Stretch. Stretch is related to Workout. Workout is related to Gym. Gym is related to Fitness. 
Single is related to Only. Only is a synonym of Sole. Sole is a synonym of Exclusive. 
Extended <--RelatedTo--> Stretch <--RelatedTo--> Workout <--RelatedTo--> Gym <--RelatedTo--> Fitness 
Single <--RelatedTo--> Only <--Synonym--> Sole <--Synonym--> Exclusive 