is the best and most pleasant of all physical activities. It is suited for
individuals of all ages and occupations, and for residents of every
climate. The child, the athlete, and the aged are all able to indulge in
this simple and effective means of keeping the body in health.

In walking, the muscles of the entire body are brought into action,
and the movements of breathing and the circulation of the blood are
increased. The body should be erect, the chest thrown out, the head and
shoulders held back, and the stride long and elastic. It is an excellent
custom to add to the usefulness of this fine exercise, by deep, voluntary
inhalations of pure air.

Running is an excellent exercise for children and young people, but
should be sparingly indulged in after the age of thirty-five. If it be
accompanied with a feeling of faintness, breathlessness, and palpitation
of the heart, the exercise is too severe, and its continuance may do
serious harm. Running as an exercise is beneficial to those who have kept
themselves in practice and in sound condition. It brings into play nearly
every muscle of the body, and thus serves to develop the power of
endurance, as well as strength and capacity for rapid movement.

Jumping may well be left to boys and young men under twenty, but
skipping with a rope, allied to jumping, is an admirable and beneficial
form of exercise. It brings into action many muscles without putting undue
strain upon any particular group.

91. Skating, Swimming, and Rowing. Skating is a delightful and
invigorating exercise. It calls into play a great variety of muscles, and
is admirably adapted for almost all ages. It strengthens the ankles and
helps give an easy and graceful carriage to the body. Skating is