Fig. 1. Ergogram of T.R., a strong, healthy girl, before taking 40 minutes' work in the gymnasium. Weight used, 3.5 kg. Distance lifted, 151 cm. Work done, 528.5 kg.-cm.
If weak and nervous, we shall look like this before taking exercise:
Fig. 2. Ergogram of C.E., a weak and somewhat nervous girl, before taking 40 minutes' work in the gymnasium. Weight used, 3.5 kg. Distance lifted, 89 cm. Work done, 311.5 kg.-cm.
And like this after gymnasium exercise:
Fig. 3. Ergogram of C.E. after taking 40 minutes' work in the gymnasium, showing that the exercise proved very exhausting. Weight used, 3.5 kg. Distance lifted, 55 cm.
In Chicago, two of whose girls are above photographed, the physician was surprised to have four pupils show more strength late in the day than in the morning. "Upon investigation it was found that the teacher of the four pupils had been called from school, and that they had no regular work, but had been sent to another room and employed themselves, as they said, in having a good time." The chart on page 127 shows the effect of the noon recess and of the good time after three o'clock.
Chicago's child-study experts concluded after examining a large number of children: