Hold a one-leg stand while your phone's motion sensor reads how much you sway. We record how long you hold (up to 45 seconds) as the main signal; the sway read-out is a bonus. Smartphone accelerometers track single-leg postural sway well in validation studies.
Hold the phone flat against your chest with one hand, or slip it in a chest/shirt pocket. Bare feet or flat shoes. Choose eyes open for your first attempts.
Prefer to time it yourself, or motion sensor blocked? Enter how many seconds you held a one-leg stand (max 45).
The Fitness Age Blueprint is educational and is not a substitute for medical care. Stop any test that causes pain, dizziness, chest discomfort, or breathlessness. © 2026 Ken Hoyer / Body Plus Fitness. Help