What is one potential consequence of invalid repetitions during training?

The choice indicating a negative impact on overall scores is accurate because invalid repetitions can lead to an underestimation of an individual's true performance. In training scenarios, particularly in assessments like the Combat Fitness Test, each repetition needs to be valid and correctly executed to ensure that performance is accurately reflected. If exercises are performed incorrectly, it may result in scores that do not truly represent the individual's capabilities, thereby misleading both the individual and evaluators regarding physical condition and readiness. Maintaining high standards in repetitions is crucial for both personal progress and the integrity of training benchmarks.