e
plethoric.

1747. Passive Exercises.

Passive kinds of exercise, on the contrary, are better calculated for
children; old, thin, and emaciated persons of a delicate and
debilitated constitution; and particularly for the asthmatic and
consumptive.

1748. Time.

The time at which exercise is most proper depends on such a variety of
concurrent circumstances, that it does not admit of being regulated by
any general rules, and must therefore be collected from the
observations made on the effects of air, food, drink, &c.

1749. Duration.

With respect to the duration of exercise, there are other particulars,
relative to a greater or less degree of fatigue attending the
different species, and utility of it in certain states of the mind and
body, which must determine this consideration as well as the preceding.

1750. Accustomed Exercise.

That exercise is to be preferred which, with a view to brace and
strengthen the body, we are most accustomed to. Any unusual one may be
attended with a contrary effect.

1751. Gradual Beginning and End.

Exercise should be begun and finished gradually, never abruptly.

1752. Open Air Preferable.

Exercise in the open air has many advantages over that used within
doors.

1753. Over-Indulgence.

To continue exercise until a profuse perspiration or a great degree of
weariness takes place, is far from being wholesome.

1754. Early Exercise.

In the forenoon, when the stomach is not too much distended, muscular
motion is both agreeable and healthful; it strengthens digestion, and
heats the body less than with a full stomach; and a good appetite
after it is a proof that it has not been carried to excess.

1755. Care Before Eating.

But at the same time it should be understood, that it is not advisable
to take violent exercise immediately before a meal, as digestion might
thereby be retarded.

1756. Time Before Eating.

Neither should we sit down to a substantial dinner or supper
immediately on returning from a fatiguing walk, at the time when the
blood is heated, and the body in a state of perspiration from previous
exertion, as the worst consequences may arise, especially when the
meal is commenced with cooling dishes, salad, or a glass of cold drink.

1757. Not After Meals.

Exercise is always hurtful after meals, from its impeding digestion,
by propelling those fluids too