30 Day Shred. Even though spring seems a long time away for those of us under 30 plus inches of snow, it is really only six weeks until sunnier days! So if you want to get your bod spring ready fast, Jillian Michaels is the best in the biz. Lose up to 20 pounds in a month by doing this 3 level workout DVD ($9) for 30 minutes a day (with healthy eating of course).