Some cities are built flat, and some cities are not. Valparaiso is one of those cities that is not, and whatever difficulties that might have presented architects in originally constructing the buildings that occupy its hills, it does only wonders for the annual Valparaiso Cerro Abajo downhill biking race that takes place in the city. Like the dizzying first-person video we featured from Valparaiso Cerro Abajo 2012, the 2013 edition proved to be full of serious action. In addition to the normal virtues of a proper bike race – speed, competition, jockeying for position, taking corners, and in this type of bike race, speeding over dangerous hills and staircases – Valparaiso’s competition also features the overwhelming influence of gravity, pulling the riders down the cities slanted hills at what might seem like impossible speeds. The downhill biking race becomes a rapid tumble down steps and hills and roads, some paved, some not, some covered in grass, some covered in stone; one ill turn of the front wheel in a situation like this and not only will you end up on the ground, but you’ll get there by launching over the front handlebars of your bike. That’s downhill biking for Adrenalists.