Workout Of the Day: Dirty Thirty For Time: 30 Box Jump (24″/20″) 30 Jumping Pull-ups 30 Kettlebell Swings (53#/35#) 30 Lunges 30 Knees-to-elbows 30 Push Presses (45#/33#) 30 Back Extensions 30 Wall Balls (20#/14#) 30 Burpees 30 Double Unders