'Regardless of your starting point, past failures, or bad luck with familial genes, you can turn things around quickly - starting with your next meal and next workout. Your genes expect you to be lean, strong, energetic and healthy.'

Take Mark Sisson's 21-day Primal Challenge and watch the pounds begin to melt away. Based on 8 key concepts and 5 action items, Mark outlines a blueprint to get your health back on track – and your body fit and toned.

- Shed at least 2lbs of fat a week
- Get a stronger, leaner body
- Increase your energy levels
- Develop an iron-clad immune system
- Improve health conditions, including migraines, tinnitus, arthritis, type 2 diabetes, arthritis, high blood pressure and cholesterol

With supermarket shopping lists (fully adapted for UK readers), simple workouts, menu suggestions and a 21-day planner, Sisson will walk you step by step through the 21 days to start reprogramming your genes and embark on a completely new way of living.

Mark Sisson is one of the world's leading authorities on evolution-based health and fitness principles. Founded in 2006, Sisson's site MarksDailyApple.com is the 3rd ranked natural health and fitness website in the world, with over 800,000 unique visitors per month. Mark, 58, is a former fourth-place finisher in the Hawaii Ironman World Triathlon Championships. Besides blogging daily, Mark conducts seminars across North America and hosts an annual 3-day Primal retreat in California. He lives with his wife and children in Malibu, California.