Just use a problem solving technique for several weeks and it will become a habit. You can develop many good thinking habits with some effort, and then be more resourceful effortlessly from that point on. Use the power of habit. This is time that is otherwise wasted or just under-utilized. Just plan that this time is for what and stuck to do your activity in planned timing.
Learning new language
Learning a new language introduces your mind to new concepts and new ways of looking at things (in English we are afraid, whereas in Spanish we have fear). It is one of the best brain exercises.
