Your quick reflexes and dexterous movements make up for your lack of stamina.
Benefit: While you are wearing light armor or no armor, if you are forced to attempt a Fortitude saving throw, you can use an immediate action to instead attempt a Reflex saving throw (at the same DC). If you succeed at this saving throw and the attack has a reduced effect on a successful save, you avoid the effect entirely. Whether the saving throw is successful or not, you are staggered until the end of your next turn. If you are prevented from becoming staggered, you can’t use Twist Away, nor can you ignore the staggered condition from Twist Away or remove it early
Pathfinder Roleplaying Game Advanced Class Guide © 2014, Paizo Inc.; Authors: Dennis Baker, Ross Byers, Jesse Benner, Savannah Broadway, Jason Bulmahn, Jim Groves, Tim Hitchcock, Tracy Hurley, Jonathan H. Keith, Will McCardell, Dale C. McCoy, Jr., Tom Phillips, Stephen Radney-MacFarland, Thomas M. Reid, Sean K Reynolds, Tork Shaw, Owen K.C. Stephens, and Russ Taylor.