Which of the following is a job opportunity for personal trainers?

Mobile personal training represents a viable job opportunity for personal trainers as it allows them to provide fitness services directly to clients in various locations outside traditional gym settings. This flexibility often appeals to clients who prefer the convenience of working out at home, in parks, or at other facilities. Mobile trainers can cater to a diverse clientele, from busy professionals to parents or seniors who may have difficulty accessing a gym. Additionally, this format allows trainers to design personalized fitness programs that are tailored to their clients' specific environments and needs.

The other options represent fields that are not specifically related to the primary role of a personal trainer. Although working in gyms is one common avenue, it is not the sole opportunity available, hence it does not capture the full scope of career possibilities for trainers. Home cooking services and sales representatives for fitness equipment, while potentially related to health and wellness, fall outside the direct personal training scope, which focuses on creating and guiding clients through physical fitness routines and goals.