Life is a type of Motivation. Breathing can be used for Life. Breathing is related to Exercise. Exercise is a type of Effort. 
Limit is related to Due. Due is related to Club. Club is related to Iron. 
Motivation <--IsA-- Life <--UsedFor-- Breathing <--RelatedTo--> Exercise --IsA--> Effort 
Limit <--RelatedTo--> Due <--RelatedTo--> Club <--RelatedTo--> Iron 