I have a desk job, and used to have a quite large office. On the back of the door I had hung up a large poster with lots of easy, quick, good stretching exercises, to remind me to take short breaks and do some stretching.
I didn't do them *once*. 
I'm a creature of habit so my "solution" is to have training as part of my daily routine. Winter is actually the best time to settle a good routine. I commute by bike, and can really feel the ill effects if I skip more than a day. Usually I climb regularly, 1-3 times a week, and if I don't I can feel my shoulders and back tense up and little aches and pains creep in, even if I'm doing other things like kayaking or biking more. Since my climbing routine isn't quite settled yet I'm thinking of adding just 5 min of regular stretching every day right after my morning commute. I now share a large office space with 4 other people so exercises at my desk are out cos I don't relish my every movement being commented on...
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett