A non-competitive adventure activity involving riding the biggest waves possible (known as "rhino hunting") is also popular with some surfers. These waves were previously unrideable due to the speed at which they travel. Big wave surfing revolutionized, as we began to use personal watercraft to tow us out to a position where we can catch previously unrideable waves. Personal watercraft can only go so far. Even with personal watercraft.... It takes "ballls" to ride these waves.