There are always reasons not to get exercise. Because you're sick. Because you're terrified of getting mugged or "jumped" by your neighbors during an evening stroll. Because you're busy.
I ran down my own personal list of reasons this morning and finally came to the conclusion that for me, I was just being lazy. I had dropped my boys off at my wife's store so I could have some time to get some work done. On my way home I stopped by the State Park, jumped out of the car, and walked up the 200 step dune climb. Then I came back down and drove home huffing and puffing.
The exercise session took all of 15 minutes out of my day.
Honestly, I'm feeling quite a bit more alert than if I had not exercised at all. So I'm hoping I'll be more productive today.