In this episode of Habits and Hustle, I chat with Mark Sisson, who at the age of 70, credits his health and fitness to his consistent workout routine, his belief in metabolic flexibility, and a diet centered around real food that tastes good. Mark shares his journey in the entrepreneurial world, from starting a supplement company in 1997 to starting his blog, Daily Apple, and later selling Primal Kitchen to Kraft Heinz. We discuss the importance of listening to one's body and developing the ability to know when to stop eating, as well as the concept of metabolic flexibility, which allows for a steady energy supply without being dependent on hunger and cravings. We also discuss the significant role of nutrient-dense foods in curbing hunger and how mindful eating can lead to a healthier lifestyle, what Mark’s go to supplements are, and how walking is better than running plus the right type of shoes to wear that truly support the feet. Mark Sisson is an American fitness author, food blogger, and a former distance runner, triathlete and Ironman competitor. What we discuss: (0:00:01) - Mark's regimen for maintaining his health and wellness at 70, and his lifelong commitment to performance. He shares his journey from marathon running to triathlon and his philosophy on diet and metabolic flexibility (0:05:40) - The benefits of biking in the sand and stand-up paddling, and the benefits of toe shoes and other trail shoes (0:16:25) - Mark's approach to eating and his advice on listening to your body to determine when you have had enough. He also touches on the idea of eating nutrient-dense foods, rather than relying on processed snacks (0:28:22) - Mark shares his entrepreneurial journey from starting a supplement company to creating his blog, Daily Apple, and eventually starting Primal Kitchen (0:38:02) - Mark's lifestyle changes after the sale of Primal Kitchen and the success of his Primal Health Coach Institute (0:45:29) - Why collagen should be considered a fourth macronutrient (0:56:10) - The concept of tracking steps with a phone or wearable device and Mark's experience with running (1:03:20) - Mark explains why walking is the best exercise for humans and the benefits of minimalist shoes for both walking and running (1:12:06) - The importance of listening to your body when it comes to eating and how Mark's background helped him become an early adopter of healthy living (1:19:22) - The benefits of walking with minimalist shoes Thank you to our sponsors: Greenfat: Head over to greenfat.com and use code Hustle20 to save 20%! OneSkin: Head over to oneskin.co and use code HUSTLE15 for 15% off. Therasage: Head over to therasage.com and use code Be Bold for 15% off. Find more from Jen:  Website: https://www.jennifercohen.com/ Instagram: @therealjencohen  Books: https://www.jennifercohen.com/books Speaking: https://www.jennifercohen.com/speaking-engagement Learn more from Mark Sisson: Instagram: https://www.instagram.com/marksissonprimal/