Fitness instructors work in gyms, fitness clubs and leisure centres, which can be noisy and crowded. They are often required to work shift work for early morning or late evening fitness classes or client appointments. Some fitness instructors work on a casual basis and may work at a number of different locations.

Fitness instructors use gym and pool equipment, weights, steps, pads, mats and safety gear during training. They also may use fitness testing equipment such as heart-rate monitors and scales to gauge a client's progress. When leading large fitness classes, they often use stereo systems and microphones.