I've been trying to be more "healthy" since the start of this year. For me this means losing weight, eating better, and eventually adding in some exercise. For overall health of course you also should keep up with routine preventative healthcare (medical, dental, vision, etc.). There are also mental, spriritual, and social components to health that shouldn't be neglected either. Purpose, focus, balance, support, and relationships are of primary importance to wholeness and wellness. You can put "being healthy" or "taking care of yourself" off, but it will eventually catch up with you in one way or another.
I simply wanted to take control of some things in life that I had just honestly let go due to laziness and lack of effort. sadly, neglect can settle into your life before you know it. In the last 10 weeks I've lost over 50 pounds, am getting organized in many areas, and am making efforts to be more intentional about things, especially relationships. Time waits for no one, but unfortunately it's what we most often take for granted.
I think for most of us the struggle tends to be the mystery of motivation.