Developed in France, Parkour is derived from gymnastics and other martial arts. Parkour focuses on self defense through tactical retreat. The art continues to grow because it is fun and also looks awesome.
Big wave surfing is a discipline within surfing where experienced surfers paddle into or are towed onto waves which are at least 20 feet m) high, on browse boards referred to as "guns" or towboards. Sizes of the board had to effectively surf these.
Bruce Lee quote - If you always put limits on everything you do, physical or anything else, it will spread into your work and into your life. There are no limits. There are only plateaus, and you must not stay there, you MUST GO BEYOND THEM.
LIFE magazine ran one of the late Flip Schulke's photographs of Muhammad Ali in 1961 "training" underwater in a Miami swimming pool. Ali swore that the underwater workouts made him the fastest heavyweight in the world.