You can’t be a successful entrepreneur if you’re afraid of being uncomfortable. Strange as that may sound, it’s a reality you’re going to have to face if you want to own and grow a business. Countless entrepreneurs, from Richard Branson to Mark Zuckerberg, have professed the importance of taking chances and pushing yourself past your “comfort zone,” but what does that actually mean? And how on earth are so many entrepreneurs able to tolerate immense mental discomfort and do things that scare, intimidate or otherwise cause them distress?