Documentary on Crossfit athlete Mikko Salo. His resting heart rate is 31 bpm! See also here.
Great deadlift / burpee metcon @34min. Compare to lullaby :-)
Wikipedia: Sisu is a Finnish term loosely translated into English as strength of will, determination, perseverance, and acting rationally in the face of adversity. However, the word is widely considered to lack a proper translation into any other language. Sisu has been described as being integral to understanding Finnish culture. However sisu is defined by a long-term element in it; it is not momentary courage, but the ability to sustain an action against the odds. Deciding on a course of action and then sticking to that decision against repeated failures is sisu. It is similar to equanimity, except the forbearance of sisu has a grimmer quality of stress management than the latter.See Pessimism of the intellect, optimism of the will.