This study investigated to what degree three different warm-up routines affect 50-yard swim performance (45.7m). The 4 female and 9 male participants, NCAA Division I swimmers, performed on three different days, a general swimming warm-up (SWIM), a combination of plyometric exercises and swimming warm-up (COMBO), or a single 50yard Swim at 90% of the maximum effort (SHORT). Each treatment was followed by 50-Yard Freestyle swimming Sprint at maximal effort following a 5-minute rest period after the completion of each warm-up procedure. Self-reported heart rate was recorded after each maximal effort. The time of each trial was recorded using a standard Colorado Timing System. Although the 50y sprint performance was not significantly affected by the SWIM, the SHORT and the COMBO warm-up (23.79 sec ±2.32), (23.74 sec ±2.12), (23.63sec ± 2.21) respectively, 7 out of the 13 swimmers swam their fastest time with the SHORT warm-up and only three swam their fastest with the conventional warm-up (SWIM). Heart rates, on the other hand, were significantly