1. Headline   1. Headline updated 12/19/2010 11:09:22 AM ET
2010-12-19T16:09:22  Frigid temps, festive food, and too many
parties: They can all extinguish your desire to work out. In
fact, women are 30 percent less active at this time of year than
when the days are long and the temps are balmy, according to the
American College of Sports Medicine.    1. More from TODAY.com
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Dick Van Dyke reunite  But new research on the psychology of
motivation suggests that when your drive to sweat is at an all-
time low, the fix may be as simple as changing up your approach.
"We're talking about easy but incredibly effective ways to
achieve goals," says Ian Ayres, Ph.D., an economist and a
professor at Yale Law School, who examines successful motivation
techniques in his recent book Carrots and Sticks: Unlock the
Power of Incentives to Get Things Done.  How to bust out of a
workout rut  Make a com