We are all constantly evolving

How quickly you evolve is up to you

So you've got a new goal.

Maybe you want to start exercising regularly. Or whatever goal you currently have.

You need to redefine yourself.
You need to change the way you speak to yourself and about yourself.

You need to start viewing yourself as someone who exercises.

I've heard people say they don't exercise because they are lazy.
Well if you decide that you want to exercise more frequently you are no longer that person.

Start saying to yourself that you are a person that exercises. Take on the new identity.

Part of the reason you took on that goal may be due to you being unhappy in some way about something.

Take on a goal and commit to it. You are now redefining yourself and moving away from your former self that you were unhappy with in whatever way.