Mark Verstegen has trained the world's top athletes for the NFL, Major League Baseball and footballers, along with the most elite """"tactical athletes:"""" U.S. Special Ops. More than a decade ago, Verstegen's book Core Performance revolutionised the fitness industry and made core conditioning and functional training mainstream.

Now Verstegen presents his most hard core program yet: a demanding system that challenges readers to perform at the highest level. He breaks down the regimen into tough but easy-to-follow workouts that help readers become far more powerful.