29 Mar March 28, 2016 Posted under: Workouts “The Filthy Fifty” 50 x box jumps 50 x jumping pull-ups 50 x kettlebell swings 50 x walking-lunge steps 50 x knees-to-elbows 50 x push presses 50 x back extensions 50 x wall-ball shots 50 x burpees 50 x double-unders