'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.