Post-activation potentiation (PAP) is a short-term increase in force that occurs immediately after performing a high-intensity activity. Although it has been largely studied in dry-land conditions, there are only few studies that have evaluated it in swimming. Results: none of the parameters we analyzed improved after the proposed training set, possibly due to the short interval we used. However, we have identified something very interesting: the athletes with the highest level of strength are those who tend to experience the occurrence of PAP. So, to know if it can work, we first have to know the level of strength of the athlete.