I agree with Sue, there are various opinions on when the best time to exercise is. I would set myself up for failure if I were to exercise right away in the morning. I get up very early to go to work, and if I were to plan my exercise that early, I would not likely achieve my goal (because when that alarm goes off, I would rather snooze).
So, I think the best time to exercise is when you can work it into your schedule and you can stick to it.
I am not a vigorous gym exerciser, but I generally take walks. I find 20 min to walk during my lunch break at work, and then I schedule another 20 min to walk after work before the bus arrives at the house with my kids. When the weather turns cold and snowy, I may go to the gym, but for now I really enjoy getting the fresh air.
I don't exercise at a high enough level to push up a block, so I incorporate my exercise around meal times so that I am supplementing my body while sticking to 11 blocks.