 Some rings are made of other metals such as steel or brass, and rattan rings are also used for exercise.Chinese forms training is done to improve the mind and body.To get the most out of your forms training, martial arts practitioner and writer Stefan Verstappen suggests that forms training be done with “brass or steel rings ...around the wrists and ankles to add weight during the performance of the form.” Verstappen states that “[s]pecial wrist and ankle weights can help in the development of muscles, and endurance.