Flight Crew Commercial; Flight Crew Flight Instructor
Situational Awareness; Training / Qualification
Ground Event / Encounter Loss Of Aircraft Control
Flight Crew Regained Aircraft Control; Flight Crew Rejected Takeoff
Human Factors
We got the clearance for takeoff. The student had a hard time holding centerline during the taxi; so my feet were on the rudder as well. [Student applied] full power and started acceleration. The airplane was on the right side of the centerline; so I was helping him to intercept the centerline with my feet. We were slowly intercepting. [I believe he tried to] intercept the centerline of the runway [too] quickly; and kicked the left rudder abruptly. At the time; airspeed was around 50 and [we] started to skid left and right. I took the controls right away; slowed it down and made it stable. It was close to [a taxiway]; so I thought we had better abort the takeoff and move off from the runway. I declared the aborted takeoff and moved off the runway.
C172 instructor pilot reported rejecting the takeoff after the student experienced directional control difficulties on the takeoff roll.