The reason why some people love to engage in dangerous activities, such as mountain climbing, car racing, and so on, although they may not be aware of it, is that it forces them into the Now—that intensely alive state that is free of time, free of problems, free of thinking, free of the burden of the personality. Slipping away from the present moment even for a second may mean death. Unfortunately, they come to depend on a particular activity to be in that state.

Eckhart Tolle

from The Power of Now: A Guide to Spiritual Enlightenment