Blogs about: Siebold

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Great Book on Mental Toughness

My friend, Andre Durand from PingIdentity, recently sent me two of his favorite books. One of them is “177 Mental Toughness Secrets of the World Class”. I only had to read the first chapte… more »

Wizard of IdM's Weblog

Great Book on Mental Toughness

wizidm wrote 8 months ago: My friend, Andre Durand from PingIdentity, recently sent me two of his favorite books. One of them i … more »

Tags: book, mental toughness, middle class, world-class


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