30-second sit-to-stand test
Stand up and sit down as many times as you can in 30 seconds, arms crossed. It measures lower-body strength and power — an independent predictor of fall risk, walking speed, and how well you'll tolerate the years ahead. Your phone counts each stand automatically from its motion sensor, on-device — or tap along. Where gait speed is signal one, this is signal two. Validated norms from Rikli & Jones (Senior Fitness Test).
Before you start
Use a stable, armless chair (about 17 in / 43 cm) against a wall. Sit in the middle, feet flat, arms crossed over your chest. Stand fully upright and sit back down each rep. Only do this if you can stand from a chair without using your hands. Stop if you feel dizzy, short of breath, or unsteady, and have someone nearby the first time.
Age and sex set your normative comparison band. Everything runs in your browser — nothing is stored or sent.
sensors Stand up and sit down…
30.0s remaining · reading motion
Time remaining
Tap once each time you stand
Your result
full stands in 30 seconds
This is an educational self-test, not a medical diagnosis. The automatic count is a screening estimate from a phone sensor and can miss or double-count a rep — check it against what you felt, and use tap mode if it looks off. Normative ranges are the Rikli & Jones 30-second chair-stand percentiles for community-dwelling adults. Discuss results with your clinician — especially if you scored below the normal range or felt unsteady.