You can trick a motion detector. A PIR sensor, for instance, measures infrared light changes. If you raise the temperature of a room to a high enough level, everything will emit the same level of radiation and the sensor won’t be able to detect those changes. If you move slowly enough, you can cover sensors with paper or cardboard so they cannot “see” movement.
However, none of these methods will work 100 percent of the time. All of them require levels of precision the human body can’t achieve.