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.
High on the list of activities doctors recommend avoiding while pregnant is horseback riding (along with downhill skiing, ice hockey and cycling.) âIn general I tell people if theyâre excellent horseback riders and are just walking around on the horse, they can continue up to 12 weeks,â says OBGYN Kay Daniels.