Start slowly if you have been inactive, but work your way up to at least 20 minutes of continuous exercise at least 3 times a week. A good walk with a little faster pace is a good way to get started without too much stress on the body (a treadmill in front of the TV is good option for some people.) Many consider exercise the best way to improve overall health, and it is one of the best ways to speed up weight loss no matter what diet plan your are on. Twenty minutes of cardiovascular exercise will boost you metabolism and help keep it up at a higher level. After 30 to 40 minutes of cardiovascular exercise, your body will start to burn fat off directly.