I swim 4-5 nights a week at the same time.
Tonight, at my usual time, I did not feel like going I was tired from running and lifting last night and I was a little cold.
But, I ended up going because it's such a habit. For the first ten minutes I was kind of tired, but then I forgot about it and ended up with a nice workout.
I used to struggle to fit in exercise, because each time, it was a decision-- do I want to go or not, am I tired, do I have time.
Now, I tend to go on auto-pilot, even though I don't really feel like it, and I noticed that I'm that way about food most of the time now.
it's so much EASIER.