The phrase "maintain a balance" is correct and usable in written English. It is often used to describe making sure that different areas of one's life, such as work and personal relationships, remain on an even keel.

The vestibular system is one of the sensory systems that provides your brain with information about balance, motion, and the location of your head and body in relation to your surroundings. There are three loops in your inner ear, called semicircular canals. The first canal senses up-and-down movement.

Walking, biking, and climbing stairs strengthen muscles in your lower body. A recumbent bike or stair stepper is a safe way to start if your balance needs a lot of work. Stretching loosens tight muscles, which can affect posture and balance.

Three systems in the body act in concert to maintain stable orientation and the sensation of being well balanced. These three systems are the visual system, the vestibular (inner ear) system, and the proprioceptive (sensory nerves) system.