“The problem with New Year's resolutions - and resolutions to 'get in better shape' in general, which are very amorphous - is that people try to adopt too many behavioral changes at once. It doesn't work. I don't care if you're a world-class CEO - you'll quit.”

American entrepreneur, investor, author, podcaster

Timothy Ferriss is an American entrepreneur, investor, author, podcaster, and lifestyle guru. He is known for his 4-Hour self-help book series, including The 4-Hour Work Week, The 4-Hour Body, and The 4-Hour Chef. Those books made him widely known for advice on optimizing everyday life, though he has since reconsidered that approach. He has also supported scientific research into psychedelic treatments, extending his public work beyond the self-help genre.