One great concept regarding productivity is based around a book called Focal Point by Brian Tracy. The idea is simple: only focus on the tasks that are going to bring about the most return on your time investment. Despite its simplicity, most people neglect this concept, and focus on low return on investment activities.
“Wim Hof Method,” which is a series of breathing exercises that flood the brain and body with oxygen. Combined with cold showers, some of the benefits he touts are improved physical performance, reduced anxiety levels, and even improved happiness levels.
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