Toning Ring for Pilates and Contraction Exercises for Thighs, Hip, Waist, Abs, and More. Ring provides resistance for targeted muscle exercises; contraction exercises for thighs, hip, waist, abs, and more. used in many Pilates exercises that work to firm and tone arms, legs, buttocks, abdominal, and back muscles. provides resistance for targeted muscle exercises to improve strength and tighten muscles throughout the body.