Desire = contract with yourself to be unhappy until a certain event occurs.
Something along those lines is what Naval, founder of AngelList said. Not sure if he came up with that, but that doesn't matter right now.
For now 5 months or so, I have been religiously working out again and making sports a clear priority. Also changing some other habits on the side. For a long time it seemed like I will never get back into shape, nothing changed. Now, after 5 months - still a long way to go - but I can see the first results of this routine kicking in.
Even though I obviously like to see the outcome, "the journey is the reward". Focus on the process and the outcome will come. However, if you not gonna enjoy the process you will not get the outcome and even if you can push yourself to get it, maintaining that status will be impossible.
Trust and enjoy the process and the outcome will follow.