Add Yahoo as a preferred source to see more of our stories on Google. CrossFit star Kari Pearce said intense, non-traditional exercises help build abs better than crunches. Her favorite underrated ...

Sara Sigmundsdottir is an Icelandic CrossFit athlete and one of the sport's biggest stars. Training her core is key, and she works her abs at the end of every session, she told Insider. Sigmundsdottir ...