Known as Nacktradler, naked bike riding is all the rage in Bavaria. The Naktiv movement - for people who like being naked and active -was born in the 1900s, when a German youth group, the Wandervogel, starting skinnydipping while hiking around the countryside. The trend led to the creation of nudist beaches along the coast, and nudity soon spread to public parks. World Naked Bike Ride day came to Munich in 2005, inspiring Alex von der Tour to offer naked cross-country cycling tours. Now around 20 men and women enjoy his nude excursions most weekends in the summer.