Jillian Michael – 30 Day Shred is a no.1 bestseller on Amazon. Recognise Jillian? She’s a personal trainer that has appeared on The Biggest Loser USA. Rather than sign up to a TV show, she can get you fit at home. You’ll learn her 3-2-1 Interval System, which combines strength, cardio, and abs, to blast though calories. Stick with it over 30 days and you’ll see dramatic results.