Switch up Pure Booty by instead of placing the ball behind the back of the knee, place the ball under the heel of the supporting foot on a standing releve.
Focus on pressing the heel into the ball, with the hips square to the barre and your upper body is resting on the barre by depressing your scapular down towards your hips. Remember to keep the length between your lowest ribs and hip especially on the working leg,
Allows you to work in a releve position with the support of the ball.
Perform 5 reps with a flexed foot and 5 reps with a pointed foot.