| 摘要 |
A plyometric box comprising a rigid body 11 having one or more recessed edges 11a, each of the one or more recessed edges being filled by a resilient component 12 that is attached to a surface of the recess. The resilient material may be any of a foam runner, closed-cell polyethylene foam, open-cell polyethylene foam, or cross-linked polyethylene foam. The resilient material may be attached using tacks, pins, staples, hook and loop fastener or adhesive. The rigid body and or the resilient components may be covered with a flexible non-slip material as shown in figures 4 and 5, which may consist of flexible vinyl or polyurethane leather. The shape of the box may be a cubiod or a frustum, more precisely a square cuboid, rectangular cuboid or a pyramidal frustum or a conical frustrum, as shown in figures 6-8. The cross sectional shape of the recessed edges and the resilient component may be a regular quadrilateral. |
