It's one of the most common New Year's resolutions. After a season of way too many cookies, candies and holiday parties, it's only natural that a vow to lose weight and get fit would follow. Each January, fitness clubs offer deals and promotions to those who want to make good on their resolutions. To those who have been at the gym for the other 11 months of the year, the crowded classes and treadmill lines make the new year a dreaded time. Luckily for gym rats, research says that 60% of gym memberships go unused and attendance is usually back to normal by mid-February. Why is that? Simple: people are lazy.