Popsugar Fitness Workouts Easy 30-Minute Workout This Is the Easiest 30-Minute, Equipment-Free Workout Ever — No, Seriously June 25, 2018 by Laura Arndt View On One Page Photo 13 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 13 Side Crunches Legs Up Target Muscles: Obliques. Start laying down on your back with your legs extended up toward the ceiling. Lace your fingertips behind your head and reach up across your body with one hand. Continue slow and controlled for one minute, alternating sides. Previous Next Start Slideshow WorkoutsStrength TrainingBodyweight WorkoutsBeginner Workouts30-Minute WorkoutsFull-Body Workouts