Kayakers hit the Animas River at 32nd Street in Durango to start the three-day competition in the Purgatory Challenge adventure stage race. The kayakers negotiated a 16-mile upriver and downriver course. Today, the competitors will tackle a 50-mile mountain bike ride. On Sunday, the Purgatory Challenge will conclude with a 26-mile mountain trail marathon. The three-day event, produced by Durango-based Gravity Play Sports, is based at Durango Mountain Resort for the bike ride and the trail marathon.