Mindset is defined as the established set of attitudes held by someone. Mindset can also be defined as an attitude, disposition, mood, intention or inclination.
Mindset is a choice. I choose to choose a good one. It often takes work to not only make that good choice, but to stick to it. Often the choice of a better mindset runs counter to our culture thus the challenge. However the challenge of a good mindset is worth the effort and I believe with practice gets easier.