Abstract: By means of literature review，comparative analysis，and other research methods，this paper makes an in-depth comparison of the training model，updating and continuing education system，self-examination requirements， and relevant information of domestic training courses of the four major certifications of personal trainers in the United States，in order to provide references for Chinese fitness trainers when choosing international trainer certificates. According to the research，personal coach certifications of ACE and NASM are more suitable for unfamiliar or will be engaged in personal coaches，while personal coach certifications of ACSM and NSCA are suitable for personal coaches with rich teaching experience. Personal trainers who do not want to spend a lot of time and energy on updating knowledge and skills after obtaining the private teaching certificate recommend to attend ACE or NASM. Instead，they can choose NSCA or ACSM. Coaches who have sufficient funds and time but want to study private coaching courses in a comprehensive and systematic way are recommended to participate in ACSM and ACE. On the contrary，they can choose NSCA and NASM. Coaches with poor English proficiency can choose to take the NSCACPT and ACE-CPT Chinese independent registration examination. Coaches with high English proficiency and insufficient funds can choose to take the ACSM-CPT English independent registration examination. Personal coaches who have not graduated from high school can take the NASM-CPT English independent registration examination. Coaches planning to travel abroad to work in the fitness industry can choose the NCCA certification；personal trainers who want to develop in the field of physical fitness can choose the NSCACPT certificate，which will be of great help to the future learning of the NSCA-CSCS system.

Key words: personal trainer, training model, examination requirements, training course, United States