Personal Trainer T-Shirt by GJP Advertising

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Designer Chris Duchaine dreamed up one hell of an interactive t-shirt. His Personal Trainer T-Shirt guides you through a timed workout based on the sweat you generate. As you sweat, a meter line on the front of this t-shirt shows how long you’ve been working out. Sure, results may vary for each wearer, but the principle itself is brilliant. [gjp advertising via fubiz]