My palms are facing downward the whole time
The flags are moving downward toward the ground
The flags create an invisible figure 8
The flag tip draws a horizontal figure 8
I do not need to flip my wrist very much (slight turn, maybe)
My elbow stays near my stomach and I “bounce” my arm
The flags rely on momentum and not on my strength
(Picky point) Flags should be symmetrical on both sides.

Be sure to do this with both your dominate and your non-dominate hand.