Which appeal suggests that participating in the fitness program can result in achieving the desired body?

The appeal that suggests participating in the fitness program can lead to achieving the desired body is the appeal to practical consequences. This type of appeal emphasizes the tangible results or outcomes that can be expected if one engages in a particular action, in this case, joining a fitness program. By focusing on the direct benefit of attaining a specific physical appearance, this appeal effectively motivates individuals by highlighting the positive changes they might experience as a consequence of their participation.

This contrast with the other choices is important for understanding the broader context of persuasive techniques. Emotional appeals typically invoke feelings or sentiments to influence decisions, while appeals to authority rely on endorsements from experts or figures of credibility. Appeals to tradition emphasize established practices or customs. In this case, the emphasis is squarely on the practical, positive outcomes of engaging with the program, making the appeal to practical consequences the correct answer.