On average, ground reaction forces increased linearly from about 1.2 times body weight when walking at around 2.7 mph to up to 2.5 times body weight when running at 5.6 mph. Slower jogging was found to have greater amounts of impact and loading forces than faster running, believe it or not. That’s because the faster one runs, the less vertical the movement tends to become, since momentum helps propel the body forward, resulting in less lifting and lowering of the body. In addition, the length of your strides when walking or running and the frequency of your strides can also affect the impact your joints experience. A very long step may result in higher landing impact forces.
So running faster may be slightly easier on the joints than a bouncy jog. Of course, you have to be pretty fit to run fast. So if you are new to fitness and not a trained runner, this might not be an option.
So run is much safer than jog to knee. Well, it will take times until I reach that stage. Meanwhile I begin to feel more hungry. I have big appetite. The more I took the workout distances, the more I hungry later. Logical, but uncontrollable.