WATCH: Victor Martinez Trains With Charles Glass

To train a legend, you have to be a legend. When superstar bodybuilder Victor Martinez was recovering from knee surgery, there was only one person who could get him back in competition shape—Charles Glass. Glass, who is notorious for his unconventional training methods, took Martinez through a leg training session that had him begging for mercy. Watch their absolutely brutal workout and pick up some tips for building your own massive tree trunk legs.