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Learning how to do scissor kicks exercise correctly will allow you to build your ab muscles fast. Scissor kicks are also known as flutter kicks.
Doing this ab exercise correctly will also strengthen your core. However, make sure your lower back is resting on the floor. You can do this easily by placing your hands under your butt.
Once you learn how to do scissor kicks, you can now advance to more challenging exercises like V-Ups.
Note that keeping your head off the floor helps activate your neck muscles.
Enjoy the scissor kicks exercise and be sure to add it to your ab workouts.