Gary Keller’s new book, “The One Thing” provides an excellent life management model for leveraging extreme focus, eliminating distractions and creating a domino effect in your life and career. The book demonstrates how things like multi-tasking and non-prioritized To-Do lists limit our success in life, undermine our performance and also make us exhausted.   Through ruthless prioritization and only working on the “1” most valuable activity or task until it is …