Rapid Fitness Model Abs This crazy effective Fitness Model Abs workout will definitely shape up your abs, obliques and lower back! Get ready to feel the burn. Flutter Kicks Flutter kicks are a simple way to give your hip flexors, lower abs and quads a workout. Lie flat on your back on the floor or on a bench. Lift both feet an inch or two in the air. Tense your lower abs to raise one leg. Alternate between raising each leg, lowering them to 1-2 inches above the ground. A flutter kick with both legs counts as one rep. Plank
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