Popsugar Health & Fitness Fast Fitness Bodyweight Ab Workout | 10 Minutes "Abs, Core, and a Little Bit More" Bodyweight Workout 15 November 2018 by Susi May View On One Page Photo 3 of 5 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 3 Trunk Twist Not only does this exercise work the abs, but it also provides a nice stretch for your back and outer hip. On your back with knees bent to 90 degrees, twist your torso to lower your legs to the floor. Use your abs to return your legs to starting position, then switch sides. Repeat for 45 seconds. Previous Next Start Slideshow Fast FitnessFast Fitness WorkoutsBodyweight ExercisesBodyweight WorkoutsIntermediate WorkoutsAb Workouts10-Minute WorkoutsStrength TrainingWorkouts