Do 20 minutes of aerobic activity (walking, jogging, running, elliptical) at least 3 times this week.
Note: This month, you should mainly be focused on just getting active and engaged in the program. A good way to get motivated is to start a workout diary. Write down the date, all the reasons why you need to work out, and what your goals are. Write down your weight (always weigh yourself in the morning for consistency), and use a measuring tape to record the size of your chest, waist, hips, thighs, and forearms, so you can monitor your progress. To stay motivated, keep notes all the way through.
Tip: Weigh in and take measurements once a month only. Focusing on quick results will only discourage you.