Popsugar Fitness Workouts 25-Minute Cardio and Strength-Training Circuit Workout A 25-Minute Cardio and Strength Workout, No Equipment Needed February 15, 2017 by Leta Shy View On One Page Photo 4 of 9 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 Jumping Jacks Add a punch between each jumping jack for extra cardio. Perform for 45 seconds, then rest for 15 seconds. Previous Next Start Slideshow WorkoutsStrength TrainingBarry's Bootcamp30-Minute WorkoutsFull-Body Workouts