A belt for training abdominal muscles comprises means (103) for determining abase girth of a user. Means (115,117, 119) is also provided for determining changes in girth of the user as aresult of contraction and relaxation of the user's abdominalmuscles. Further means (125) provides feedback to the user as to the extent ofcontraction of the user's abdominal muscles,the feedback being displayed as a continuous, progressive indication of thedegree of contraction of the user's abdominalmuscles. A training method employs the belt and comprises the steps of:placing the belt around the waist of a user and determininga base girth of the user. The user's abdominal muscles are contracted andrelaxed so as to provide feedback to the user as to theextent of contraction of the user's abdominal muscles, and a continuous,progressive indication of the degree of contraction of theuser's abdominal muscles is noted.
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