Why can’t gender be determined in adolescent skeletons

I believe I learned this in my forensics class. The skeleton of an (older) female is usually determined by the pelvic region. The wide hips and cervix area. (As women grow their hips and cervix move outward in order to give birth and house a child) In adolescent skeletons the hips and cervix on the female haven’t moved outward yet. Therefore making both the male and female skeletons look almost identical in the region they most use to determine (the pelvic and hips) I hope that’s right and what you were lookin for!

The best way is to swollow and hold in your breath

The answer is "false". improved balance is not a primary benefit  of regular cardiovascular exercise.