With a booty band around the bottom of your thighs, balance on your right leg, and move your left foot so your toes are resting on the ground slightly behind and diagonal to your right foot. There should be tension in the booty band.
Tighten your core, and kick your left leg back about eight inches (or more) behind you.
Return your left foot to starting position, keeping tension in the band. Then begin the next rep. After your set is complete, switch legs and repeat.