"Ha'a Keaulana, daughter of Brian Keaulana and granddaughter of legendary Buffalo Keaulana carries a 50-pound boulder while running across the sea floor to train for surfing. At 13-second intervals between waves, that means about a minute of being held down. It is one thing to hold your breath in a swimming pool for a minute and it something completely different to swim down 30 feet, pick up a huge rock and then run as hard as you can for a minute.