Yeah, I have to agree. I don't think I have ever regretted getting some exercise in. I personally work late nights a lot now, so getting up early isn't in me. But I have most afternoons open so that is when I exercise.
Anyway, personally, finding exercises I like to do keeps me motivated. Change it up a bit too! Recently I've been checking out Youtube for some different videos: I've got zumba dances, some pilates, some tae bo videos now. I have the 30 day shred video. Then mix it all up! Today I'll do some zumba, 30ds, maybe some tae bo. I did pilates yesterday!
You'll feel great afterward too! Not only your body but your mind too. You will have a feeling of satisfaction and accomplishment!
Keep it movin'!!!