Half is related to Percentage. Percentage is a type of Proportion. 
Psychologist is related to Training. Training is related to Exercise. Exercise is related to Building. Building is related to Gym. 
Half <--RelatedTo--> Percentage --IsA--> Proportion 
Psychologist <--RelatedTo--> Training <--RelatedTo--> Exercise <--RelatedTo--> Building <--RelatedTo--> Gym 