With the looped band above the knees (at least an inch higher than your kneecaps so the bands don't pull on your knees), start in a wide squat position, keeping your weight in the heels and hips back with chest lifted.
Drive through the left heel, as you kick the right leg straight to the side, angled slightly backwards with a flexed foot, tightening your glutes at the top.
Lower down to the start and repeat on the same side. Do 20 to 30 reps. (Switch sides on the next circuit.)