The holidays are upon us, and all your time goes to arranging, scheduling, or attending parties, trolling for suitable gifts on ULTA for friends, family and colleagues, and generally stressing out on all the work that needs doing before the break. At the back of your mind, you are resigning yourself to gaining back all that weight you lost over months. It does not have to be that way. You can do all the things you normally do and still keep fit during the holidays. Here are some great tips on how to do it. Exercise in short, intense bursts You can forego the hour you habitually spend every day…