1) Maintaining Health
This includes exercise and eating healthy. It's one I know many of us don't want to hear, but so much of our energy, physical and mental, depends on us maintaining a healthy lifestyle and giving our bodies what they need. You don't need to train for the Olympics or a body building competition, but you do have to do something. It's essential, and I'm struggling through the beginning stages of making this a habit as well.
Our brains need nourishment just as much as our bodies. And just like rising trends of junk food, there has never been a time where we have access to so much junk to put into our minds. Instead of reading your favorite gossip blog or newspaper find a good book, or load up on the large number of uplifting blogs online. Instead of flipping through TV channels, go to YouTube and watch TED Talks or Talks at Google. Instead of listening to the radio as you go to work, load up your phone with hours of uplifting podcasts. The effort is worth it. I can personally tell you that I feel differently as I have attempted to fill my life with more uplifting material than things that are merely entertaining or even destructive.
C.S. Lewis said, "You can make anything by writing." Taking 'anything' at face value, I believe that through writing, you can make the best version of you that you could ever become. You don't need to be a strong writer (I never considered myself a writer, and neither did my English teachers as indicated by the only D's and F's that I've gotten in my educational career). You don't need to write for anyone but you. It can be in the form of a journal or a blog or fictional story. Writing is an exercise that allows your brain to explore, dream, imagine, analyze, expand, and develop to help you in all aspects of your life.
4) Develop a Sense of Curiosity and Wonder
My father was a great example of this as I was growing up. He seemed to have knowledge in a large amount of topics, but was able to spend much of his time with passions he had - camping, astronomy, radio. Try things and go places that you've always wanted to. Recently, my family was able to visit Yellowstone National Park for Public Lands Day. As we saw geysers, wildlife, waterfalls, dense forests, mudpots, and a variety of other beautiful landmarks of this planet, I was filled with wonder and was inspired by the beauty found in nature. So much of our day to day lives are filled with ideas, technology, and other items only because someone once thought , 'What if...'
There is a time and a place for all that we do. As important as it is to work hard, if you don't ever allow yourself any leisure time, you're going to do more damage than you do good. If we're too caught up in self improvement, we can quickly forget those important people around us, who deserve love and attention. If we are so consumed with finding our passion that we refuse to work until it's in our chosen field, we open ourselves up to much pain and struggle.
I like this quote and think it's essential to keep moving in our lives. When we're stopped, life will knock us around and largely leave us there. However, if we're using our willpower to keep moving, we will still get knocked around by life, but it will send us on trajectories that we could have never attained by staying in the same spot.