A Stall

A stall is a condition where the airflow separates from the wing, increasing drag and reducing lift such that the aircraft can no longer sustain level flight.

At low angles of attack, the separation point of the airflow from the aerofoil is towards the rear and a turbulent wake is not significant.

However, as the angle of attack is increased, the separation point moves forwards and the turbulent wake is larger.

A stall occurs when the critical angle of attack is exceeded and can occur at any airspeed.

Stall Recovery

Because a stall has to do with an exceeded angle of attack, the recovery is to reduce the angle of attack.  

A pilot should pitch the nose down by removing any applied back pressure on the control column or to positively apply forward pressure.

To minimise loss of altitude during the recovery, full power is normally applied to increase the airspeed as quickly as possible and to provide energised airflow over the tail surfaces.

Centre of Gravity

An aft center of gravity location can increase the likelihood of entering a stall, and it may also complicate the stall recovery process, potentially making it more difficult to regain controlled flight.