I rarely read newsletters, but I frequently read @Schwarzenegger's health/fitness newsletter. I don't know if it's the content itself or him as a person that attracts me, but I find it very relatable and helpful in combating aging and maintaining my health. Highly recommended. I think it might be because he has summited Mount Everest several times during his career, which makes his articles more inspiring. This isn't some career mentor/life coach; he writes them himself. And the content he discusses is very specific and practical.