| 摘要 |
A portable practice runway is provided with an improvement comprising cross members made of flat spring steel with the central section of the cross member thereby lying flat on the surface allowing the runner's foot to substantially fully engage the ground when the cross member is inadvertently stepped on. The cross member is preferably of one piece with the upstanding side members being formed by bends in the cross member. The upstanding legs have sufficient resiliency to flex when the cross lines are inadvertently stepped on by the runner thereby allowing the runner's foot to more fully engage the ground to prevent injury. In the relaxed position, the cross members are provided with a pre-bow so that when the lines are attached, the center section will be drawn flat with the running surface and the upstanding legs will be positioned substantially vertical. In one embodiment, an integral loop at the top of the vertical legs supports the side members and forms the joint between adjacent sections.
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