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since we only have a certain amount of ‘adaptive energy’ for every day (or training session). If we subject our bodies to too much stress, we stop improving, plateau or break.
Ross Edgley • The Art of Resilience: Strategies for an Unbreakable Mind and Body
Christopher Allen • The Dunbar Number as a Limit to Group Sizes
More recently, a study of 20 men in their 50s found that four hours of walking in a forest ‘significantly increased levels of serotonin’ (the ‘happiness’ hormone) when compared to walking in a city.
Christopher Allen • The Dunbar Number as a Limit to Group Sizes
Campbell and Brickman coined the term “hedonic treadmill”
Scott Galloway • The Algebra of Wealth: A Simple Formula for Success
“Dunbar’s number” is a theoretical cognitive limit on the number of stable social relationships humans can maintain at one time. According to Robin Dunbar, a British anthropologist, humans have the cognitive capacity to keep track of somewhere around 150 close personal connections. Beyond this limited circle, we start treating people less like indi
... See moreJosh Kaufman • The Personal MBA: A World-Class Business Education in a Single Volume
frequency of defections on up to 10 per cent of interactions will have little or no effect on the average number of friends an individual will have; frequencies greater than 10 per cent will have a small effect on the overall number of friends, but will mainly reduce the number of strong and medium ties,