I am reading two books with overlapping content related to "bio-hacking". The first is called What Doesn't Kill Us by Scott Carney. The book is about using breath holding exercises and exposure to cold temperatures to burn fat and hack your body. The second book is The Paleo Manifesto by John Durant. Durant is writing about his experiences living as a modern caveman by eating a pre-agriculture diet and adopting other lifestyle habits that are more natural in tune with the way our bodies have evolved. Both works have are interesting and are worth giving a read if you are in to the subject.