Certificate of maternal rehabilitation. The four certifications of fitness instructors include: sports rehabilitation certificate, maternity rehabilitation certificate, functional gadget training certificate and emergency rescuer certificate, among which pregnant women can teach as long as they have maternity rehabilitation certificate. Fitness coaches, divided into group gymnastics course coaches and personal coaches, organize bodybuilders to do planned fitness exercises or aerobics. Fitness coach refers to the staff who guide the training of members in a fitness club. Its work is interactive and targeted and charged by the hour.