Since the begining of this month, I've been getting up an hour earlier and either going on the exercise bike in the garage, or out for a ride for half an hour or so. It was tough the first week or so getting out of the habit of sleeping in late, but now I just set the alarm same as always and get up in the morning and get on with it.
The biggest motivation for me is that I already notice the difference when I go out for a proper ride. I've always only done 1 ride a week, and not particularly pushed hard then, so to change to riding most days has meant a leap forward in my fitness. I'm riding where before I was pushing, and getting real pleasure out of climbs now, rather than just struggling my way up in order to ride back down.
There's nothing at all hardly to ride around here, so I can only really do a quick loop on tarmac cycle lanes and road, but every moment your heart rate is up and you're sweating is a benefit. I'm timing myself too now, and noticing the times start to fall. Hopefully soon I'll be able to stretch the rides out a few miles and make it a bit more interesting.
So get out and do it. I also feel far more awake at work, so its win all round really.