Gretchen Rubin, the New York Times best selling author of the Happiness Project, The Four Types, and Happier at Home, joins us today to teach us about personality types and how they can effect habit formation. We dive into how to recognize the personality types of others and how this skill can help build management skills in business and how they can be used in the fitness industry to motivate your clients.   This episode is brought to you by Foursigmatic Mushrooms.  Use code Muscle for 15% off your mushroom needs.