https://en.wikipedia.org/wiki/Accelerated_freefall
In most AFF programs, two instructors jump with the student during their first three AFF jumps, although some programs may use only one instructor. On the initial levels, the instructor(s) hold on to the student until the student deploys their own parachute. Hence, this method is classified as "Harness Hold Training." The AFF instructors have no physical connection to the student other than their grip on the student, so once the student's parachute is deployed the instructors fly away and deploy their own canopies.