Insane Cardio Workout Challenge - Hardest FB Workout Yet? Climbing the Mountain

Is this the hardest Fitness Blender workout yet? Calorie burn info & printable routine @ At-home Workout Programs @ Exclusive workout videos, Workout Challenges, and site features @ 2 Week Workout Challenges @ Advanced search tool for over 600 free workout videos @ The most supportive fitness Community on the web @ Meal Plans written by Registered Dietitians @ Healthy Living articles and recipes @ Fitness Blender Gift Cards @ We use PowerBlock adjustable dumbbells @ Fitness Blender’s Workout Programs and subscription platform, FB Plus, make it possible to keep our individual workout videos and website free. We were founded with, and remain committed to, the goal