Immersion

Flow is a natural high.

Sharp

A sharp knife can safe a runner's life.

Despite the naked, unprotected exposure to objects that have the potential to injure the barefooted runner, wounds are exceptionally rare though. In the domestic environment injuries occur more often — small pieces of glass are the main cause of cuts. Thorns are the most common perpetrators of barefoot obstruction in the outside world. Their smallness is inversely proportional to the cause of hinderance and need to be removed to remain fully mobile and in balance. A sharp knife -- and the abililty and willlingness to use it -- is one of the few basic tools that serve the barefooted runner well.

See also: https://bartvanbroekhoven.com/en-US/component/search/?searchword=thorn&searchphrase=all&Itemid=298

Wuwei

Inaction.

See also: "One must be able to let things happen."

Parkour in the mist

The symmetrical garden of the Assumburg Castle in Heemskerk. Training can be characterised by its symmetrical composition. To 'go the distance', say 10 K, requires to get back the same distance. This is where the benefit of training lies. Especially in the winter. You can't just stop. You will freeze. You have to keep moving to return. This is how endurance is built. There is no quitting option.

Fun

Landscape is an instrument to be played rhythmically.