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This one is not as easy as it looks, but it's a great move for your buns, back, hamstrings, and abs.
How to do it: Start lying down on your back, with both knees bent and feet flat on the floor about hip width apart. Place one dumbbell in between your knees and squeeze it with your inner thighs to hold it in place. Slowly start lifting your pelvis, then lower back, middle back and then your upper back off the floor, pressing your hips to the ceiling. Slowly lower back down.
Form tip: Avoid 'popping' your body up and down, but instead roll through each section of your spine and concentrate on pushing your heels into the ground to work your glutes even harder.
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