Balance...

Often on mornings like today I find myself trying to decide between going to the gym or doing some other activity with my kids.
This is when the mommy guilt kicks in and says "Your kids will only be young once. You need to make sure every waking hour is full of some life developing activity." Then my physical body chimes in " You neeeeeed exercise...without it you are not the nice mommy you want to be!" Then the "want to please my kids" Mommy says "just wait until this evening when the husband comes home and then you can actually run outside!"
Physical body..."Don't try to pull that one on me...you know that when Dad gets home all you want to do is hang out with him and the kids."

Back and forth they argue until finally I put my gym clothes on and drag lazy rear-end and children to the gym. Then later in the day post-workout, I remember that indeed I am a much nicer mommy after I have worked out.
So the question is...why do I have all the dialog and indecisiveness in my mind when inevitably the result is the same?