Answer by  
                                                                                          lonelywolf (2117)
                                                            
                          
                          
                                                          A lot depends on why your skin is loose, but usually the best thing is to get bigger muscles, and this will tighten the skin.  Lift weights - focusing on big compound movements like squats, pull-ups and bench press.  Then, add additional exercises to target the area with loose skin.