Is Balancing A Skill or A Fitness Component?

There is a debate between my friend and my PE teacher and I just want to know what you think. Can you please say why you think that so i can show my teacher! Thanks!

It probably is a bit of both, although I'd say more practice than a skill; however, the biggest factor is fitness. A person whose body has muscular tone and a normal center of gravity will be able to balance with less effort and for longer periods of time.

Balancing is A Skill

In biomechanics, balance is an ability to maintain the center of gravity of a body within the base of support with minimal postural sway.

Keeping balance requires integration of inputs from multiple senses (equilibrioception (from the vestibular system), vision, and perception of pressure and proprioception from the somatosensory system) with the motor system responsible for muscle actions. The senses must detect the change of the body position with respect to the base (whether the body moves or the base moves). The limit of stability of an individual standing quietly upright is defined as the amount of postural sway at which the balance is lost and the corrective actions are required. The limit of stability may be described by an irregular cone above the support base.