| 摘要 |
<p>An apparatus for use in the performance of gymnastic movements includes an inner tubular support for receiving and supporting the lower limbs of a gymnast, an outer annular casing housing the tubular support, the tubular support and the annular casing being rotatable relative to each other, and the outer annular casing including a peripheral exterior surface of a generally outwardly convexly curved configuration for continuously and uninterruptedly contacting the ground upon motion being imparted to the apparatus by the lower limbs of the gymnast.,</p> |
