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.
To have success in completing exercises during pregnancy, it is a good idea to plan the days and times during the week when you will exercise. As shown in the photo above, prenatal yoga is a great, low impact exercise that can be highly beneficial for pregnant women.