Step your right leg behind you and to the left so your thighs cross. Bend both knees to lower into a lunge. Try to keep your front knee aligned with your front ankle and, if possible, lower until your front thigh is parallel to the ground.
Push off the right foot to return to standing, but instead of placing your foot on the floor, lift it out to the side. Keep your foot flexed to engage your glutes, and keep your hips square to the front.
Lower your right leg to return to the starting position. That's one rep.
Repeat for 45 seconds, then repeat on the other side.