I will try not to get this post removed this time.
Is the female pelvis. The symphysis pubis is the problem. Its allows the pelvis to flex during child birth.
Pelvic girdle anatomy
This is a comparison between the two. The top one is female and bottom one male.
The forces involved on the pelvis walking and running are completely different between male and female. The muscles and ligaments are different as well. I only know this from designing replacement hips. But as far as I could tell a bloke is about 10-15% more efficient at walking and running than a woman just purely by the way they are built. The forces on the joints are different and also the re distribution of forces through the pelvis are different as well.
And Nutloose is a ginger beer. I suspect apart from an amateur interest in female anatomy I suspect it was missed out from his trade training. I would like to think though that it would be included in the training for PTI and also DS staff who are in charge of training recruits.