The study investigated the effects of rehearsal learning and warm-up exercise on the time of performing different swimming strokes. The study was conducted among 202 college freshmen students taking up a course on physical education concentrated in swimming. The design employed is a mixed factorial (2 X 2) where time of swimming is measured before and after implementing the rehearsal. The respondents underwent warm-up exercise and half of them did not receive the warm-up. Results indicate that generally, the students became faster on their speed of swimming after the rehearsal, F (8, 191) = 11.89, p less than 0.05 and significant differences were found between the groups that received warm-up and the no warm-up exercise on the swimming speed, F (8, 191) = 2.48, p less than 0.05. Warm-up exercises have significant effects specifically on one arm with breathing, back kick and arms on waist. Rehearsal learning had medium to large effect size while warm-up exercise had small effect size on swimming speed. (Contains 4 tables.) [Published in The International Journal of Research and Review, Volume 2, March 2009.]