Challenging recreational outdoor sport is rafting/white water rafting. This activity involves the use of an inflatable raft on a river or similar water body – usually white water or rough water of varying degrees – purely for recreational thrill. There are several different forms of rafts. The symmetrical raft, which has a double-bladed paddle at the stern for steering, is the most commonly-used in both Australasia and Europe. The asymmetrical rudder-controlled raft, the symmetrical raft with oars (central helm), and Stern Mounts with rear oar frame are the other types of rafts. Like many extreme sports, it’s essential to follow basic safety precautions since white water rafting can be extremely dangerous. Although there is generally considered to be more risk with private trips, commercial trips have also had injuries and deaths, but the sport has improved its safety records over the years. As a result, some regions have legislated safety regulations. Like many sports, the quality and specialization of the gear has improved and expertise has increased in the sport. This has also resulted in the difficulty ratings of rivers being changed. For example, the Colorado River in the Grand Canyon or Jalcomulco River in Mexico have previously destroyed boats, but are now safe for commercial runs with licensed outfitters leading amateur passengers.