Day 2 of Week 5 has 3 sections. The first section is a 28-minute HIIT section consisting of 7 exercises repeated 4 times (50 seconds work, 10 seconds rest). The second section is a 12-minute HIIT section consisting of 6 exercises (30 seconds work, 10 seconds rest) repeated 3 times. Followed by a rep-based finisher. Required equipment: Heavy dumbbell (Christine uses 20lbs), Medium dumbbells (Christine uses 10lbs), a chair or box for box jumps (or squat jumps).