Pilates Resistance Power Ring の説明 from Pro Source
The ProSource Pilates Resistance Ring adds a new dimension to the classic Pilates workouts, providing light resistance to help tone and strengthen your core and entire body. The ring challenges your balance and causes your muscles to adapt and become stronger, making it great for both general conditioning and rehabilitation. Foam handles on each side make it comfortable to hold in your hands and place between your feet or knees. The sturdy steel magic circle is covered in durable rubber, so no matter how much you twist, turn, and squeeze it, the shape will hold. Long-Lasting accessory and easy to transport, it is a great accessory for your everyday workouts.