Curtsy on a wobble, dare your stabilizers to keep up.
Keep your front foot dead center on the dome and your hips square to the front.
The curtsy step crosses one leg behind and across while the front foot balances on the centre of the dome, so the front quad drives the rep while the glutes, especially the outer fibres that control hip position, fight the twist the curtsy line creates. The unstable dome amplifies exactly that fight, keeping hips square becomes the exercise within the exercise. Trained on each side in turn, it earns its place for building the lateral hip control that straight-line lunges never touch.
The crossing step angles the load so the outer glute of the front leg has to stabilise the hip against rotation and tilt. On the dome that demand doubles, it is as much a hip control drill as a leg builder.
The front foot, planted dead centre on the dome, that leg is the working leg. The back foot travels behind and across into the curtsy, then you drive up through the front foot, finish your reps and swap sides.
The crossing motion narrows your base and swings your weight sideways, which the dome exaggerates. Shorten the curtsy step, move slower, and keep your chest tall over the front foot, range can grow once the wobble is boring.
