Eugenics anomaly?

I found this description on page 33 of “Defining the Defective: Eugenics, Aesthetics, and Mass Culture in Early 20^th Century America” “The Woman of Tomorrow” to develop strength and beauty through vigorous exercises was demonstrated by a short haired woman, whose hard, flat body…”(emphasis added) to be very curious.  Consider, this was in an era in which a woman's cutting her hair short was considered to be an act of rebellion, and when any woman worthy of the title was to have a small waist, large hips and large bust.  Yet the eugenics movement is using as a model the woman described above.

Joyce Abbott