El cuerpo perfecto en 4 horas

The book covers a wide range of unconventional methods—I'm curious about how he chose which ones to test and share. Did he focus on the most effective or the most surprising results?

I've been considering some of the methods, but I wonder how many are actually practical for everyday life. What worked for others, and what didn’t?

Ferriss’s approach feels almost like a science experiment—what do you think led to his obsession with pushing human limits in such specific ways?