Tip on how to reduce your overall morgage fast

This technique is so simple l don't know way people are not taking advantage of this situation.Let me explain what l mean if your mortgage $120.000 and your mortgage was $600 dollars a month if you paid additional 120 dollars a month over the term of that mortgage let say 10 years you would save $20.000 dollars over that term of the mortgage this is a considerable saving in interest payments and it will also reduce the term of your mortgage.