Join Krystal for this dynamic 30-minute cardio workout featuring two intervals repeated twice through. The first round of each interval is low impact, while the second round picks up the intensity with high-impact options. This workout tests your cardiovascular system while working your entire body through exercises like squats, planks, kicks, skaters, mountain climbers, and bicycle crunches, finishing with focused core work using a single dumbbell. Equipment needed: One dumbbell (8-12 lbs recommended)