slimnastics
noun
                                                                                                                            
                                                            slim·nas·tics
                    
                                                                                                              
                                                                                                                                  ˌslim-ˈna-stiks 
                                                      
                                                          
            
            
               plural in form but singular in construction             
        
    
                                
              
          
                                                      : exercises designed to reduce one's weight                                      
                
                    
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  Merriam-Webster unabridged




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