Becoming a personal trainer requires a combination of physical strength and psychological awareness. After all, a trainer may play multiple roles with a client, alternating between coach, mentor, teacher, cheerleader, or even drill sergeant as the situation demands. Outgoing, positive people with an attention to detail and a capacity for improvisation will likely flourish in this career. On the other hand, the strongest person in the gym may not be a good fit for this career, if he or she isn't able to connect with and inspire clients.

Time management and the ability to multi-task are also essential in this career field. A trainer should be comfortable using an organizer to schedule clients.

In addition to general PT certifications, most gyms require trainers to be CPR certified, and be able to run an AED, or an automated external defibrillator. In most cases, a high school diploma or GED is also required.