This Force technique is used when the Force Grip power is activated, which is a standard action to normally activate Force Grip. This technique allows you to spend a Force point as a free action when Force Grip is activated, i.e. in the same turn, thus on the characters next turn they do not need to spend a standard action to maintain their Force Grip.
Round 1 character spends their move action doing whatever, standard action to activate Force Grip and a free action and a Force point for Improved Force Grip.
Round 2 the character may use their full allotment of actions for this round and they automatically maintain their Force Grip for this round due to the Improved Force Grip technique.