Cross it back and light up the side of your glutes.
Keep your hips and shoulders square to the front, don't twist as you drop.
Stepping one leg behind and across into a curtsy shifts the working quad into an angle a straight lunge never finds, and the band tension from shoulders to floor climbs as you drive back up to standing. Your glutes, especially around the outside of the hip, control the crossed-leg descent and power the stand while keeping your pelvis level. It earns a place for training the legs across the body's diagonal, hitting hips from an angle that squats and standard lunges leave alone.
Resistance that peaks at the top. Bodyweight curtsy lunges get easy as you stand, but with the band anchored under your feet, the drive back up meets increasing tension, so the whole rep stays loaded.
Probably twisting. Keep your hips and shoulders facing forward while only the leg travels behind and across, and sink straight down rather than leaning. If the front knee wobbles inward, shorten the step.
The crossed-back angle works the hips and thighs through a diagonal that forward and reverse lunges miss, and the balance demand of the crossed stance builds control around the hip. It suits anyone whose leg training is all straight lines.
