It takes a certain amount of courage to trust an unstable surface, especially when you are up in the air. Even a sturdy bridge that wobbles feels insecure. Also, it is fun to jump up and down on a wobbly bridge and make it bounce.
How do you enjoy testing your courage?
Testing my courage? My efforts are often in the mental/communicative realm rather than a physical spot. Trying to speak up for my beliefs and my opinions which often run counter to the majority can be a test for me . Once I see that someone actually has listened to me and is weighing my words gives me courage to try again when the opportunity arises.