![Dr. Peter Attia on The Importance of Strength Training During a Fast | The Tim Ferriss Show](https://i.ytimg.com/vi/jKyYvna5VjA/sddefault.jpg)
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tim ferriss 4 hour workweek 4 hour body 4 hour chef timothy ferriss entrepreneur author writer angel investor ferriss tim ferriss blog timothy ferriss speaker Tim Ferriss Podcast dr. peter attia peter attia fasting zero fasting app strength training weight training resistance training longevity peter attia md