Filthy 50By Jessica Thomas / January 5, 2016 For time: 50 Box Jumps 24/20″ 50 Jumping Pull-ups 50 Kettlebell Swings 16/12 kg 50 Walking Lunges 50 Knees-to-elbows 50 Push Press 45/35# 50 Back Extensions 50 Wall Balls 20/14# 50 Burpees 50 Double Unders