Cruel is a synonym of Mean. Mean is related to Trick. Trick is etymologically related to Track. 
Workout is related to Gym. Gym is related to Room. Room is related to Internal. 
Cruel <--Synonym--> Mean <--RelatedTo--> Trick --EtymologicallyRelatedTo--> Track 
Workout <--RelatedTo--> Gym <--RelatedTo--> Room <--RelatedTo--> Internal 