You can read an edited extract focused on dopamine and serotonin here.

"Focused breathing, well, it requires focus. Simple as that. Find a quiet, comfortable space where you can sit or lie down without distractions — this will help with focus," Dr. Tracy explains.

One of the greatest things that I recommend for anybody is relaxation breathing. Whoever thought a breathing exercise would be a terrific thing to do? It's very simple. You learn it in less than a ...