Water 2: Intermediate Water Aerobics is a class is for women and men ages 18 years and older. This class is appropriate for all adults who enjoy the water. It is a safer option for people who want to get back into exercise after an injury or surgery. Although water may be the preferable option for people to exercise while they heal from surgery, most participants are not under medical care. It’s also a safe exercise for pregnant women. Because water exercise is easy on your joints, many seniors enjoy this popular class.