| 摘要 |
An apparatus includes a frame having a substantially planar first portion and a substantially planar second portion. The first and second portions are spaced rigidly apart from each other in a substantially parallel orientation to define a passage that extends through the frame between the first portion and the second portion. The passage is dimensioned and configured to receive a hand. A central axis extends longitudinally through the passage. The apparatus further comprises a first pad and a second pad located on an exterior of the first portion of the frame and spaced apart from each other to provide a channel that extends longitudinally between the first pad and the second pad substantially orthogonal to the central axis. The channel may be configured to align with the spine where the first pad and the second pad are positioned to lie on opposing sides of the spine.
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