Christmas gains
Among other things, Christmas is a time of gluttony. All the festive food and delicates that belong to the traditions. And all that chocolate.
No wonder so many people promise to start working out at the break of the year. Need to get rid of that all excess weight accumulated during the holidays.
It's all temporary after all. Gym's remain crowded only during the first half of January. Week of gluttony and two of fitness. But if done properly, that should be enough to maintain the balance. That is, if there was balance to return in the first place.