...Old age should burn and rave at close of day.
The gentle way is not so gentle:
Gentle inactivity leads to > weakness leads to > slower gait speed > decreased balance > decreased energy levels > decreased resistance to injury and illness > increased probability of a fall and serious injury with a grave outcome as a result - a life cut short with a greatly diminished quality of life.
To burn and rave at the close of day:
Increasing strength leads to > increased gait speed > increased balance > stronger muscles and bones > increased endurance and energy levels > increased resistance to illness and injury > decreased likelihood of falling and a greater probability of surviving a fall unscathed - a significantly higher quality of life for far longer in later years.
Generally people are not placed in senior care for being out of breath; it is usually because they are too weak to carry out daily activities safely.