Dean Karnazes is a freak in the best possible way. I don’t often feel lazy or out of shape but next to this bloke, I’m Humphrey Bear in a hammock. If you’re into human optimisation, developing resilience, exploring your potential, lowering your biological age and living healthy into old(er) age, you’ll dig this episode. TIME magazine named Dean one of the “Top 100 Most Influential People in the World.” Men’s Fitness hailed him as one of the fittest men on the planet. Stan Lee, of Marvel Comics fame, called him, “A real superhuman.” An acclaimed endurance athlete and NY Times bestselling author, Dean has pushed his body and mind to inconceivable limits. Among his many accomplishments, he has run 50 marathons, in all 50 US states, in 50 consecutive days, he’s run 350 continuous miles (563km), foregoing sleep for three nights. He’s run across the Sahara Desert in 120-degree temperatures, and he’s run a marathon to the South Pole in negative 40 degrees. On ten separate occasions, he’s run a 200-mile relay race solo, racing alongside teams of twelve. His long list of competitive achievements includes winning the World’s Toughest Footrace, the Badwater Ultramarathon, running 135 miles nonstop across Death Valley during the middle of summer. He has raced and competed on all seven continents of the planet, twice over. Like I said, freak. Enjoy.