This is a Yoga wheel backbend artifact, it can help open the chest and shoulders, because the Yoga wheel can naturally match the curve of the back spine, and it is more convenient to roll with hardness.
Yoga Blocks Yoga Assist Wheel Yoga Roller Wheel
Yoga Accessory Yoga Wheel Backbend Yoga Prop Roller Yoga Wheel Back Support
Yoga Wheel Backbend Yoga Accessory Yoga Back Yoga Roller Wheel
Yoga Circle Wheel Yoga Prop Wheel Soft Back Wheel Roller for Leg Gym Indoor
Yoga Resistance Ring Yoga Accessory Sports Yoga Wheel Yoga Circle Pilates