1. Scissor Kicks.
Begin lying down with your arms propped up on your elbows behind you. Lift both legs a few inches off the floor, and bring your right leg as close to your chest as possible. Begin to lower your right leg while simultaneously raising your left leg to switch sides. Make sure not to let your heels touch the ground until the end. Complete 30 reps, 15 on each leg.
2. Butt Raises.
Begin lying on your back with your legs in the air and the bottoms of your feet toward the ceiling. Keeping your palms flat on the ground, squeeze your abs, and lift your hips off the floor. Lower your hips back down with control. Repeat this 10 to 15 times, and complete three sets.
3. Leg Straddles.
Begin sitting on the floor with your legs stretched out in front of you and feet together. Place your hands behind you to the sides, and lean your upper body back to a 45-degree angle. Raise and separate your legs until you’re in straddle position. Then bring your legs back together while lowering them to the ground with control. Complete three sets of 10 to 15 reps.
Source : www.cosmopolitan.com