This exercise is called the monster walk because you will be taking giant steps forward and backwards creating tension in the band to strengthen the glute muscles.

Place the band around your legs as shown and create some tension in the band.
Assume a semi-squat position with both knees bent.
Take a large step forward with your right foot as you drive the both knee out, feeling more tension in the band. Then take a step with your left foot.
Continue to walk forward for 10 to 15 steps.
Reverse and walk backwards for 10 to 15 steps.