Stretch is a type of Exercise. one thing you do when you Exercise is Fatigue. Fatigue is related to Syndrome. 
Ground is related to Lot. Lot is related to Empty. Gut is a type of Empty. 
Stretch --IsA--> Exercise --HasSubevent--> Fatigue <--RelatedTo--> Syndrome 
Ground <--RelatedTo--> Lot <--RelatedTo--> Empty <--IsA-- Gut 