Popsugar Health & Fitness Intermediate Workouts 100-Rep Core Workout This 100-Rep, Core-Busting Workout Takes All of 4 Minutes to Complete 13 February 2018 by Jenny Sugar Image Source: POPSUGAR Photography / Kathryna Hancock You're not into wasting your time, but luckily, you don't need to devote hours at the gym for a strong core. You just need to do the most effective ab-strengthening moves, and this four-minute workout has them all! You'll target your upper, middle, and lower abs, as well as your obliques. The Workout What you'll need: floor space, a pull-up bar, and a medicine ball 20 scissor abs 20 diamond sit-ups 20 knees-to-chest hanging from a pull-up bar 20 double crunches with a medicine ball 20 reverse crunches Perform this workout once a day for one week and see how you feel! If you're not sure how to do each movement, see the descriptions ahead. Scissor Abs Image Source: POPSUGAR Studios Lie flat on your back. Extend your arms so they're against the sides of your body with your palms pressing into the floor, or bend your elbows and place your palms under the back of your head. Bend your knees and draw them into your ribs. This will make it easier to pull your navel in toward your spine and actively press your lower back flat on the ground. Lift both legs straight up toward the ceiling, continuing to engage your abs and pressing your lower back into the ground. Keeping your core strong, slowly lower your right leg down toward the ground until it is a few inches above. Then slowly, moving with control, scissor your legs, lifting your right leg back up as you lower your left leg down toward the ground. This counts as two reps. Continue alternating for a total of 20 reps. 1 / 4 Diamond Sit-Up Image Source: POPSUGAR Studios Lie on your back and open your legs into a diamond shape (known as Butterfly pose in yoga), with the soles of your feet pressed together and knees out wide. Extend your arms overhead. Curl your torso up, and tap the floor in front of your feet. Slowly lower back to the starting position to finish off one rep. Complete 20 reps. 2 / 4 Double Crunch Pulse With Medicine Ball Image Source: POPSUGAR Photography Grab a heavy dumbbell for this move. Begin lying on your back with your legs in the air, toes toward the ceiling, holding the medicine ball over your chest with straight arms. Engage your abs to press your low back into the mat while lifting your head, neck, and upper back off the mat. Exhale and round your low back so the bottom of the pelvis raises as you lift your upper body an inch higher off the mat. Aim the medicine ball toward your ankles as you perform this double crunch. Inhale, and lower your pelvis and upper back an inch toward the floor and continue slow pulsing for 20 reps. 3 / 4 Reverse Crunch Image Source: POPSUGAR Photography Lying on your back, lift your legs in the air with your knees bent. Place your hands on the floor beside you. Without momentum, use your lower abs to slowly curl your hips off the floor and into your chest. Slowly lower them back to the starting position. This counts as one rep. Complete 20 reps. 4 / 4 Intermediate Workouts5-Minute WorkoutsWorkoutsAb ExercisesStrength TrainingFitness ChallengesFull-Body WorkoutsCrossFitCrunchesPOPSUGAR Challenges