To turn Enzo's desire to become a faster swimmer into a specific goal, the best approach among the options provided is for him to focus on skills he will need to improve his time.
Setting a specific goal involves identifying measurable skills that can enhance performance, such as stroke technique, starts, turns, and pacing strategies. Enzo can choose specific areas to concentrate on, create a training plan, and track his progress over time.
While getting support from friends and family, interviewing fast swimmers, and boosting serotonin levels through meditation and yoga are all beneficial, they are supplementary to the main goal of improving his swimming technique and performance. Focusing on technical skills will have the most direct impact on Enzo's swimming times.