Shorter days combined with increased social obligations (read: Christmas parties) and extra errands (read: Christmas shopping) can really cut into your gym time. To maximize your time and fit some stress reducing exercise into your compacted schedule, why not organize a lunch hour walk? If you organize a few of your work mates to get out and about and walk with you the chance of flaking out decreases. You get to burn some calories and breathe some fresh air. Talk about a win/win situation. Plus, you can gossip while you walk! Now that is efficient multi-tasking!