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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 much towards the surface of the body which are designed for the solution of the food in the stomach.