Bridges to normal humans are things that make life easier because they connect things that, well, don't connect. We get on it and we get to the other side. Bridges to this professional stuntman are obstacles meant for epic stunts, like riding a motorcycle on top of one of the bridge's arch beam!
And somehow, someway, this epic ride on top of a bridge looks easy when he does it. I (and I hope you) would never dare try such a thing but man, he's up and down in seconds with minimal wobble.