What the Exercises Are For
The XBX will improve your general physical condition by:
increasing muscle tone;
increasing muscular strength;
increasing muscular endurance;
increasing flexibility; and
increasing the efficiency of your heart.
Each exercise is included because of its contribution in one or
more of these areas.
The first four exercises are primarily to improve and maintain
flexibility and mobility in those areas of the body which are usually
neglected. They also serve as a warm-up for the more strenuous exercises
Exercise 5 is for strengthening the abdominal region and the
muscles of the fronts of the thighs.
Exercise 6 exercises the long muscles of the back, the buttocks,
and the backs of the thighs.
Exercise 7 concentrates on the muscles on the sides of the thighs.
These muscles get very little work in routine daily activities, or indeed
in most sports.
Exercise 8 is primarily for the arms, shoulders, and chest, but at
the same time exercises the back and abdomen.
Exercise 9 is partly for flexibility in the waist area and for strengthening
the muscles of the hips and sides.
Exercise 10, the run-in-place with jumping, while exercising the
legs, is primarily for the conditioning of the heart and lungs.
The two supplementary exercises are included for those who wish
to do a little more. One exercise is for strengthening the muscles of the
feet and the ankle joint. The other is for those muscles of the back
and abdomen which assist in the maintenance of posture.