The four major certifications refer to certificates with NCCA certification. NCCA is the national committee of American certification bodies, which is responsible for implementing and maintaining all kinds of project certification services according to the requirements of NCCA certification standards. NCCA is the authority of professional certification standards, and NCCA benchmark represents the best and most comprehensive standard for evaluating project operation. NCCA evaluates professional competence through certification scheme to ensure public health and safety.

The four certifications of fitness, commonly known as the four certifications, are recognized by the international fitness industry and refer to the four certifications of National Sports Medical Association NASM, Physical Fitness Association NSCA, Sports Medical Association ACSM and Sports Committee ACE. The full name of NASM is National Institute of Sports Medicine.

For the field of personal coaching, NASM is widely recognized by the industry; The members of NSCA come from all walks of life and cover a wide range. The qualification certificate issued by NSCA has been recognized by 54 countries around the world. All the certifications of ACSM are authorized by the National Quality Inspection Committee, and they also have high gold content in the industry, attracting thousands of members to refer to them every year. As a highly recognized certification body in the industry, ACE has offered many training courses in the United States. At present, there is a great demand in the private education market. Passing ACE certification is of great help to the career prospects of private education.