This excerpt from Dave Asprey's book Head Strong examines how to improve brain function by optimizing mitochondrial activity. Asprey details five common brain weaknesses, including fatigue, poor memory, and mood swings, that are rooted in mitochondrial dysfunction. The book outlines a two-week program to address these issues, focusing on diet, exercise, light exposure, and supplementation. Asprey argues that by improving mitochondrial function, individuals can increase brain energy production, enhance cognitive performance, and achieve a higher quality of life. The book also explores advanced techniques like cold therapy, ozone therapy, and electrical stimulation to further optimize brain function.