Exercise rut

I have found myself in the exercise rut I get in every winter. When it's warm out I like to walk and jog outside. I did that a lot this past summer mostly because it was something to do with W and he loves riding in his stroller. So when we were bored with our inside toys we'd walk, and walk and walk some more. Come October/November it starts getting a little breezy and colder so we don't get out as much. But I still make a conscious effort to do something whether it's lifting free weights, doing some yoga stretches, or forcing myself to take a brisk walk around the block with my dog. I do pretty good with that until either the first snowfall or the first sickness. Since this winter has actually been pretty well characterized by both, I don't even remember the last time I exercised. Which lands me in a vicious cycle I like to call the exercise rut. I have energy and feel good when I exercise regularly and when I don't exercise regularly I have little energy and no motivation. So when I'm not exercising regularly I'm very unmotivated to begin exercising again after having not for a while. See my dilemma?
So I was excited this year when our church announced they were starting this walk to Jerusalem program. They are hoping as a church body we can walk some 6,000 miles (the distance from here to Jerusalem) before Easter. I thought this would be my chance to get back on track. I thought having my name posted on our fellowship center wall with my progress would motivate me and be good accountability. But it's not making a bit of difference. My goal was to get up at 5:30 three days a week to lift freeweights or take a walk even if it's cold. But my bed is oh so warm at 5:30 in the morning and it's way too easy to reach over and turn the alarm off. I tried lifting freeweights later in the day but W was way too interested in what I was doing and I accidentally bonked him in the head with one of my weights. I'm sick again too which rules out the possibility of walking outside in this frigid weather. Apparently I'm not nearly as disciplined as I once thought I was! Any suggestions?