The hangover is over, the parties are done and now it is the time to move into the reasonably slow return to form and work that is January.  Now is the time that resolutions are adhered to with religious zeal.  Its easy to get up in the mornings and don the workout gear, the running shoes and jog off into the early morning glare.  With warm mornings and some people still away on break, there's so much less distraction.  Make use of that and set the habits now so you don't get distracted later on when its March.