“15-Minute Cardio Core 4.0 Workout”

No equipment needed. Tip: Complete Series 1.0, 2.0 and 3.0 for 4 weeks each prior to Series 4.0. Burn mega calories, work muscles to exhaustion and lose fat with this quick, challenging cardio and core-driven workout. Find the Weekly Workout Schedule for this Series, and more, on my website (FitnessMaggie).