One day you made a decision to do workout everyday, for example. Imagine that there are many choices when you back home such as watching TV, playing games and reading books. You would think that's ok to do workout after reading books or playing games. To do this way of thinking a lot, you are going to be tired meaning that your willingness to achieve your goal tends to be degreased. To prevent this situation, I could propose one good solution to you. Just do it in the morning. The reason why you do that in the morning is that you have no choice to do other things because of the limited time. Anyway, please trust me and just try.