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Mountain bikers ride on off-road trails such as singletrack, back-country roads, wider bike park trails, fire roads, and some advanced trails are designed with jumps, berms, and drop-off to add excitement to the trail. Riders with enduro and downhill bikes will often visit ski resorts that stay open in the summer to ride downhill specific trails, using the ski lifts to return to the top with their bikes. Because riders are often far from civilization, there is a strong ethic of self-reliance in the sport. Riders learn to repair broken bikes and flat tires to avoid being stranded. Many riders carry a backpack, including water, food, tools for trailside repairs, and a first aid kit in case of injury. Group rides are common, especially on longer treks. Mountain bike orienteering adds the skill of map navigation to mountain biking.