=Abdominal Exercise, No. 1.=--Several good exercises for the abdominal muscles are here given, which can be taken upon rising in the morning and upon retiring at night. With just enough clothing to keep the body from chilling, lie flat on the back upon a folded comfortable spread upon the floor. Without bending the knee, raise the foot toward the ceiling as far as possible, then the other foot, so alternating ten times or oftener. Next raise both feet together. While these movements should be brisk, the limbs should not be allowed to drop back upon the floor, but the muscles should be kept tense. Next, from the vertical position of the leg, bend the knee and press it closely upon the abdomen for a moment, then restore to the vertical position and lower to the floor. Alternate the limbs as before, then take them together. By means of a loop, or other simple arrangement, to keep the feet from rising, lift the head and trunk to a vertical position by contracting the abdominal muscles. This is a severe exercise, and should not be attempted by those who have any special abdominal weakness. The strain may be relieved, however, by propping the head and shoulders with pillows, so as to make, with the lower limbs, an angle of about forty-five degrees. Gradually, as the abdominal muscles increase in strength, take out one pillow after another, until able to raise the body from the horizontal position. The latter exercise may be still further graduated by first resting the arms at the sides; next cross them on the chest, and then clasp the hands behind the neck before lifting the trunk. In gymnasiums it is not an uncommon thing to see a person with well developed abdominal muscles lift another person lying prostrate across his chest, and weighing anywhere from one hundred and fifty to two hundred pounds, by the sheer force of these muscles. =Abdominal Exercise, No. 2.=--Sit on a bench or stool, and with feet under a couch, or hooked into a strap fastened to the base-board of the room, with arms folded upon the chest, bend forward and backward, as far as possible, without strain. Repeat ten to twenty times. After a few weeks, increase the bend. =Abdominal, Side, and Back Muscles.=--Stand erect with hands on hips. Keep head, neck, and legs rigid, and lungs well filled. Bend slowly backward and forward several times. Bend from side to side. With feet firmly planted, bend forward, and revolve the head and trunk to the right, back, left, front, and assume an erect position. Bend forward again, and reverse the order of movement. Repeat several times. Next, stand erect, with hands firmly planted on hips, and twist the body from the waist upward, first to the right as far as possible, then to the left, and repeat ten to twenty times.