An Elderly, Previously Withdrawn Nursing Home Patient Is Encouraged to Start

An elderly, previously withdrawn nursing home patient is encouraged to start a program to improve his physical fitness. He begins participating 5 days a week in weight training, tai chi, and supervised walking. Four months later, his gait speed during a timed six-meter walk has increased by 50% compared to his baseline speed. This increase in speed:

A) Increases the likelihood he will fall
B) Is an indicator of better health and a reduced risk of mortality
C) Increases the likelihood he will have heart attacks and/or stroke
D) Is unlikely to be sustained