One of Beachbody's most popular fitness programs is 80 Day Obsession, designed by supertrainer Autumn Calabrese. It involves 80 days of unique daily video workouts, plus a specific portion-controlled meal plan to follow, and takes 13 weeks to complete. Each workout builds on the day before to help you get stronger every day. It's fun, fast-paced, you can do it at home (or wherever you are), and the most important thing is that it works! Look through these transformation photos to see what can happen with 80 days of determination and consistency.