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Flutter Kicks

Performing the: A Step-by-Step Tutorial Flutter Kicks

Lift your legs off the ground about 6 inches, keeping them straight and your toes pointed.
Keep your abs engaged and your lower back pressed into the floor, begin to lower one leg.
As you lift that leg, lower the other, 'fluttering' your legs up and down.
Continue this alternating or 'fluttering' movement for your desired amount of reps or time.