The sphere of life force is what I call the space within which we operate before hitting the sisu threshold; our outer boundary of inner strength. Ideally, you want this area to be as wide as possible. This episode describes how to expand it through everyday life and how I use it in daily life and to prepare for challenges during extra long ultra runs.
"if you know the way broadly you will see it in all things" - Miyamoto Musashi (Japanese samurai, 1584-1645). Book recommendation: The Book of Five Rings -> https://www.holybooks.com/wp-content/uploads/The-Book-of-Five-Rings-by-Musashi-Miyamoto.pdf
"Get constructively uncomfortable." - Dr. Rhadi Ferguson, Judo Olympian, BJJ black belt. https://www.drrhadiferguson.com/coffee-with-rhadi/coffee-with-rhadi-something-i-went-through-how-i-recovered
What we talk about when we talk about the Default Mode Network (of the brain):
Frontiers in psychology: https://www.frontiersin.org/articles/10.3389/fnhum.2014.00619/full
Killingsworth M. A., Gilbert D. T.: A wandering mind is an unhappy mind. Science. 2010 Nov 12;330(6006):932.
Konjedi S, Maleeh R. A closer look at the relationship between the default network, mind wandering, negative mood, and depression. Cogn Affect Behav Neurosci. 2017 Aug;17(4):697-711.