Day 4 of Week 2 is a 3 part workout. The first two sections are 12 minutes each, consisting of 4 exercises (50 seconds on, and 10 seconds rest), repeated 3 times per section. The final section is a burpee and squat-walk finisher: starting with 10 burpees, followed by some squat-walks, then 9 burpees followed by more squat walks, and so on all the way until 0 zero burpees. Equipment required: a heavy weight (Christine uses a 20lbs dumbbell or kettlebell) and a set of lighter weights (Christine uses 9lbs dumbbells).