Answer by  
                                                                                          SCanfield (26)
                                                            
                          
                          
                                                          Soaking in a bathtub for a long time allows all the grime to come unworked as the warm water opens your pours.  It saves gallons of water as opposed to a long shower, and it's very relaxing.  Also, you can sit, expending no energy as you get yourself clean in a relaxing environment.