Here's a thought:

When is one "in shape" and how do you know? I was just thinking...because no matter how much you work out or run or go to sports practices or whatever, you're always tired in the end. Some days more tired, some days less....but just how do you know when you're in shape? Boggles my mind...

I'm sure there is a very simple answer I just don't know, but I was just sitting here thinking...(which is always dangerous for me) haha