Often, the most popular “self help” books and theories are too general and vague to be really meaningful besides getting people to feel good about themselves. This is done on purpose - the more general the advice is, the more people can buy the product. The fitness industry is incorporated into a lot of the self-improvement industry because people assume that people who “look good” are happy. It’s especially easy for influencers on social media to have people believe their success because we only see pictures and snippets they want us to see, not the full story. Success and improvement at anything is a time consuming, high effort challenge that can’t be conquered with a book, set of supplements, or any single thing.