Worn in any shoe, the iShoe (intelligent shoe) insole enables early diagnosis and rehabilitation of deteriorating balance. The insole provides a diagnostic readout to a wearer or clinician through any computer. If balance is compromised, the insole uses tactile stimulation to prevent falls and for rehabilitation. The insole notifies caregivers, loved ones, and emergency services by phone if a fall takes place. Originally developed to facilitate astronaut balance during a moon landing, buying an inexpensive iShoe insole is a small step for seniors, and a giant leap for geriatric mobility.