I can't exercise much in the evening beyond yard or house work. I don't sleep if I don't stop before 6 p.m.
So I get up around 4:40 a.m. (have only had the alarm go off once in 3 weeks since I started) and walk on the treadmill for an hour, or do a 1/2 hour walk and 30 minutes of weight training, or use the Wii Fit for the other 1/2 of the hour.
I don't have any excuses (yard work, housework, kids' activities, dinner to make, etc.) and I'm really more of a morning person by habit anyway.