Arena can be used for Competition. Competition is related to Swim. Swim is related to Free. 
Person wants (to) Recover. Person is related to Being. Being is related to Free. Free is related to Plant. 
Arena --UsedFor--> Competition <--RelatedTo--> Swim <--RelatedTo--> Free 
Recover <--Desires-- Person <--RelatedTo--> Being <--RelatedTo--> Free <--RelatedTo--> Plant 