It all comes down to these things: Heart & Motives.
Although we can not judge others heart and motives, we can take responsibility for our own heart and motives. Others may not even know why we do what we do, but we do. When it comes to the big issues that we face or our life decisions, I realize that our heart & motives are the two factors that speak loudest to answer the WHY question. Stepping back and asking yourself why you do what you do is a vital part of living an honest life. These are also the things that God is concerned with. Doesn't 1 Samuel tell us the story of how "man looks at the outward appearance, but God looks at the heart?" (1 Samuel 16:7). A pure heart is one that pursues godliness. God is always speaking about the condition of the heart.
I have been challenged to consider this verse: "Above all else, guard your heart, for it is the wellspring of life" (Proverbs 4:23).
In the last couple of months I have been thinking a great deal about fitness and healthy living, and I have been inspired to a reconsider how I approach them. Why do we exercise? Why do we pay attention to our bodies and why do we want to make healthy choices? I have been challenged to a new paradigm of thinking where our ultimate reason for doing these things is to honour God with what he has given us- our body! By taking care of what God has given to me, I am honoring him. This has totally revolutionized my thinking because what the media and the world say is so contrary to this way of thinking. We are told that we should exercise to look good for other people and that it will increase our self-image and self-worth if we are skinny and "good looking," but that is so opposite of the way that God views his children. We are made in his image. He takes pleasure in us. We are more than skin deep. We are so precious and valuable in his sight. It is so motivating for me to think of taking care of my body as a response to God- let me worship you with the way that I use my body and the decisions that I make. When the Scriptures talk about our bodies being the Temple of the Holy Spirit, I believe this means that we have the indwelling of the Holy Spirit within us, so I want my response to be to "honour God in my Body" as it says in 1 Corinthians 6:20. Some people have accused me of taking that verse out of context because the preceeding verses relate to sexual immorality; however, I belive this phrase is true in every real of our lives and can be carried over to different sectors. I don't think God compartmentalizes things like we do. We tend to say that one thing only pertains to a certain context, but really, truth should carry over into every realm of our lives. So we can honour God with whatever we choose to do. I've realized that out of this attitude and comes much joy and a real fullness of life. I feel like I have been living life so fully in the last while, by simply embracing this truth that I can honour God with my body and that he views me as a wonderful creation and I don't have to earn that or be a certain way to receive that. I want to walk in light of this. I also want to affirm other poeple in who they are in Christ, as I discover these truths as well. I am alive! 
