How XBX Was Developed
XBX is the product of extensive research into the problems of
physical fitness for girls and women.
The research was conducted at several RCAF stations and in the
later stages included sections of the civilian population.
Over 600 girls and women of all ages participated in the project.
The RCAF is indebted to these persons for their contributions to the
The first step in the project was the administration of a series of
physical fitness tests. The tests included an examination of muscular
strength and endurance, testing of heart response to activity, and
measurement of fat layers. From the results of these tests the physical
fitness needs of women were analyzed.
Experiments were carried out with a wide variety of exercises to
determine those most effective in producing the desired results. Many
of these exercises were discarded as ineffectual. The ten exercises of
XBX provided the most balanced and effective program.
The time limits for each exercise were varied until the optimum
time for good results was determined.
Tests were conducted to arrive at the number of times each exercise
could be done, and should be done, within the time limits.
The first experimental exercise programs were used by several
hundred women. Periodic tests showed that XBX was an effective plan
to improve levels of general fitness.
The program was then distributed to groups and to individuals
across Canada for further trial
and comment. Further modifications
in the plan were made on
the basis of this final field trial.
The results of this research
are presented in this plan on this site.