Answer:
Competitive Athletes.
Step-by-step explanation:
The ¨highest ranked¨ fitness individuals group between the options is ¨competitive athletes¨, people who dedicate considerable time of their lives to a determined physical activity or sport, could be in a semi or professional way, but this level of discipline, asks for an intensive training (several times per week) and other requisites to accomplish in order to be competitive (strict diets, avoiding alcohol and other harmful substances, between others).
Based on this we can affirm if a hypothetic fitness activity begins, and different kind of people are invited or participate, it´s clear that will be more probable that the winner will be one of the ¨competitive athletes¨. Their performance level will be higher compared to inactive, begginers, or ocassional athletes.