All participants enrolled in a 12 week community-based tai chi program.

12-week community-based tai chi program

The number of times a person can stand up and sit down from a chair in 30 seconds

The time (in seconds) for a person to stand from a chair, walk 10 feet, turn 180 degrees and return to sit in the chair

How long (in seconds) can a person stand with feet together, stand with one foot forward and to the side, stand in tandem (one foot immediately in front of the other, and stand on one foot

Hip abductor muscle contraction speed as measured as the time (in milliseconds) between the onset of electromyography signal and torque onset from hip muscle abduction

The bBESTest is an 8-item, clinically-based assessment measuring anticipatory postural adjustments, compensatory postural responses, sensory orientation, stability in gait, and the timed up-and-go test.

the ABC scale assesses self-reported confidence during 16 activities related to mobility.

The magnitude of proprioception error was measured on the participant's dominant lower extremity with a custom-built device25,51 that allows for rotation around the axis of a semi-goniometer to measure proprioception in the transverse plane at the hip joint. Proprioception was assessed by measuring the accuracy of actively pointing a marked line on the second toe to target angles along the semi-goniometer during two conditions, a vision condition and an occluded vision condition.