"When skills and challenge are matched...this results in a psychological flow!"

FLOW is a psychological concept …and is said to occur when attention is fully focused on the task at hand...self consciousness disappears...e.g...a tennis player, in a crucial match…hits certain shots that he/she has never practiced before !

In flow...one can do wonders !!!

The key word here seems to be: total concentration!

Zen idea of "no mind" is also a kind of flow!