POPSUGAR Fitness ExerciseTV Aside Free 20-Minute Strength Interval Workout by Fitness 11/12/08 0 Shares Like us on Facebook Click to ReadFree 20-Minute Strength Interval Workout This 20-minute cardio class will challenge you to work cardio intervals alternating high intensity drills with short recovery breaks. Train your body to not only burn calories but to be a fat-burning machine! 0 Comments Read More ExerciseTV Aside POPSUGAR, the #1 independent media and technology company for women. Where more than 75 million women go for original, inspirational content that feeds their passions and interests. Get fit with our daily newsletter Running Working Out Weight Loss Yoga Sign up with By signing up, I agree to the Terms and to receive emails from POPSUGAR.