Popsugar Fitness Treadmill Workouts 30-Minute Cardio and Strength-Training Workouts Burn Fat and Build Muscle With Any of These 30-Minute Workouts 21 April, 2018 by Christina Stiehl View On One Page Photo 8 of 12 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 30-Minute HIIT Circuit to Lose Weight and Build Muscle Maximize the after-burn effect with this HIIT circuit that uses a combination of free weights and bodyweight moves for a total of 30 minutes. Previous Next Start Slideshow Treadmill WorkoutsCardio Workouts30-Minute WorkoutsFull-Body WorkoutsWorkoutsStrength Training