FIXED RUN' The TERM 'FIXED RUN' is a type of running exercise that involves running a predetermined distance at a steady pace. It is often used by runners to improve their endurance and speed, as well as to help them reach their goals. The fixed run can be done on a track, road, or trail, and the distance and pace are determined by the runner. This type of running is beneficial for those who want to increase their overall fitness level and improve their performance in races.