Abstract: A tumbling strip including a plurality of panels, each panel having a channel defined along a centerline thereof. The plurality of panels are arranged such that the channels in each of a pair of adjacent panels are aligned with one another. A plurality of inserts are provided within the channels so that the tumbling strip has an increasing resistance to deformation as an amount of deformation of the tumbling strip increases. A fastening assembly selectively attaches adjacent panels in the plurality of panels to one another. An adjustable support assembly provides a variable amount of support for the tumbling strip so that the rebounding action of the tumbling strip can be varied depending on the amount of support provided by the adjustable support assembly.

Abstract: A form-keeping device to be worn on extremities of an athlete is disclosed. A first part has a first element for spacing the extremities apart at a predetermined distance. This first spacing element has a first front face covered with pile and a first opposite face which conforms to a body part, such as an ankle of the athlete. A second part has a second element for spacing the extremities apart at the same predetermined distance. This second spacing element has a second front face covered with hook-like projections for engaging with the pile covering the first front face on the first spacing element. The second spacing element also has a second opposite face which conforms to an opposite body part, such as the other ankle of the athlete.