A 35 year-old male client has a goal of completing a sprint distance triathlon. The certified Personal Trainer prescribes an exercise regimen of swimming 2 days per week, running 3 days per week…

Reversibility describes the loss of fitness adaptations that occurs when training is reduced or stopped, which is not illustrated here.

Overload refers to stressing the body beyond its current capacity to stimulate adaptation, not to matching training modalities to a goal event.

Progression refers to gradually increasing training volume or intensity over time, which is not the focus of selecting sport-specific activities.

Specificity states that training adaptations are specific to the muscles, movements, and energy systems used in practice. Because the client's goal is a triathlon involving swimming, running, and bicycling, the trainer prescribes those exact activities so the body adapts to the precise demands of the event.