DETAILED DESCRIPTION OF THE INVENTION This application is a continuation-in-part of U.
S.
Ser.
No.
08/695,312 filed Aug.
9, 1996, which is a continuation of U.
S.
Ser.
No.
08/363,629 filed Dec.
23, 1994 the disclosures of which are incorporated herein by reference.
Suitable water-dispersible polymers employed in the target devices can be prepared by any method known in the art.
Typical methods are disclosed in U.
S.
Pat.
Nos.
5,153,037; 5,043,196; 5,035,930; 4,863,655; and 5,272,181 the disclosures of which are herein incorporated by reference.
Many such polymers are commercially available and can be obtained from American Excelsior Company, Arlington, Tex.
; National Starch & Chemical Inc.
, Bridgewater, N.
J.
; Evergreen Solutions, Inc.
, Minneapolis, Minn.
; Air Products & Chemicals, Inc.
, Allentown, Pa.
; Novon Products Company, Morris Plains, N.
J.
; and Novamont North America, New York, N.
Y.
Examples of water-dispersible polymers include hydroxybutyrate-hydroxyvalerate copolymer, cellulosics, poly(lactic acid), polycaprolactone, starches, modified starch products, high amylose starch products, poly(vinyl alcohol), hydroxyethylcellulose, poly(ethylene glycol), and mixtures thereof.
Typically the water-dispersible polymers disperse in water in a period of time in the range of from 1 second to 30 minutes, preferably in the range of from 1 second to 20 minutes, and more preferably in the range of from 1 second to 10 minutes.
In a preferred embodiment, the target device comprises a water-dispersible polymer which is biodegradable.
In an especially preferred embodiment, the water-dispersible polymer at least partially dissolves in water.
Examples of suitable water-soluble polymers include high amylose starch products containing at least 40% by weight amylose, poly(vinyl alcohol), hydroxyethylcellulose, poly(ethylene glycol), and mixtures thereof.
The water-dispersible polymer can be in any suitable form such as film, sheet, or foam.
Foam products are preferred because of their ease of handling, rigidity, printability and floatability
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Exercise Devices2 
