In self-improvement, it's mandatory to also focus on your spirit.
You need to improve your mind, body AND spirit to be ubermensch. Without your spirit your are just an empty shell (aka NPC).
That's why I HIGHLY recomment meditation (it also has a lot of mental and physical benefits) and you MUST also awaken your third eye (or pineal gland, 6th chakra etc). It will help you a lot with your daily life and your intuition will be literally on steroids.
I recommend you this book if you are serious about awakening your third eye. I can also answer question if you are interested in this subject.
http://www.eso-garden.com/specials/awakening_the_third_eye.pdfBE CAREFUL! DO NOT attempt to do the techniques from that book if you are not seriously interested in the spiritual or occult life or take it for granted.