The airplane exercise is an challenging fitness exercise and requires an intermediate fitness level. As the hold requires you to tilt your body forward maintaining control throughout the exercise. The exercise requires stability from the leg for a good level of balance. 

From a standing position, bend over at the hip as you balance on one leg with the other leg fully extended behind you.

Place your arms out to the side to balance your body, like wings on a plane.

Hold this position for 10 seconds before switching legs and balancing on the other side.