Case in point: I wanted to run the Princess half and it was important to me. I ran a ton, even though it was hard, it sucked and it hurt often. Now that the 1/2 is done I have not run or even walked as much as I should have. Because it is hard, it sucks and it hurts. I am still exercising but not as much as I had planned on at this point. I am a work in progress. I can still change that and every week I have a goal and if I meet it, great if not then that is ok too.
No matter what it is in life, exercise, personal hobbies, or just anything. If it is important to you, you will find a way. If not, you'll find an excuse.