17 May 2013 Corey CrossFit San Rafael, Double Unders at Corey's Gym/North Bay CrossFit in San Rafael May 17, 2013 Corey Corey’s Gym Ed taking on The Giraffe! “Filthy 50” For time: 50 Box Jump 24/20 50 Jumping pull-ups 50 KBS 35# 50 Walking Lunges 50 K2E 50 Push Press 45# 50 Back Extensions 50 Wall Balls 20/14# 50 Burpees 50 Double Unders