It may be too much to ask students who have reached middle or old age to try all these exercises in physical betterment or follow all these instructions in physical coordination. But what they may find impossible to perform or what they may be disinclined to practise, they can still make advantageous use of in the following way. Let them bring such teaching to the notice of younger persons, to children in their teens and those just beyond the threshold of adulthood--for it is far easier for these younger persons to do than for older ones. The effort required is much less, the habits not so much encrusted.
-- Notebooks Category 5: The Body > Chapter 5: Exercise > # 10