isometrics
noun
                                                                                                                            
                                                            iso·met·rics
                    
                                                                                                              
                                                                                                                                  ˌī-sə-ˈme-triks 
                                                      
                                                          
            
            
               plural in form but singular or plural in construction             
        
    
                                
              
          
                                                      : exercise or a system of exercises in which opposing muscles are so contracted that there is little shortening but a great increase in tone of muscle fibers involved                                      
                
                    
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  Merriam-Webster unabridged




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