The ever-talented Jordin Sparks recently made headlines after dropping over 50 pounds thanks to a life style change. Through eating right and exercising (it sounds so easy doesn't it?) she completely changed her body! I love the Mountain Climber because you can do it anywhere and even a few reps can make your core feel like it worked hard. Check out one of Jordin's favorite moves! "Mountain Climber Works: Core, butt, and legs Get in plank position, feet hip-width apart. Pull your right knee toward your chest. Extend your right leg as you pull your left knee toward your chest to complete 1 rep. Do 20 reps."