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In a growth mindset, people believe that their most basic abilities can be developed through dedication and hard work—brains and talent are just the starting point. This view creates a love of learning and a resilience that is essential for success.

When people believe they can get better, they understand that effort makes them stronger. Therefore they put in extra time and effort, and that leads to higher achievement.

Your fixed beliefs about yourself will prevent you from making positive change. If you have a trait that you believe cannot be changed, such as your intelligence, your weight, or your bad habits, you will avoid situations that could possibly be uncomfortable or that you think that are useless.

Getting in shape, and maintaining that condition is not easy, there will be setbacks, plateau and time's you completely fail. 
Having a growth mindset is the key to success in these situations. Yes, hard work, effort, and persistence are all important, but not as important as having that underlying belief that you are in control of your own destiny.