Carbon dioxide. Carbon dioxide (chemical formula CO2) is a colorless gas with a density about 60% higher than that of air (1.225 g/L) that is odorless at normally encountered concentrations. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms.
You should only do ballet in pregnancy if you are used to it. Ballet stretches can place a lot of pressure on your joints, especially your pelvic joints, and standing on one leg can cause pain in your pelvis.
Conceptually, all women who are pregnant should have the luxury of being barefoot too ... meaning, they should be able to kick up their feet and dance ... or sit ... or lie down .. or make love ... because they are loved and cared for. It need not be by the father of the baby...