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The warm up exercises comprise stretching. A stretching exercise is the proprioceptive neuromuscular facilitation (PNF). To examine the effect of PNF, 23 swimmers (11 boys and 12 girls), aged from 12–15 years participated in the training program that included this type of stretching. 11 swimmers (5 boys-6 girls) performed for eight weeks, three times per week in addition to swimming training, six PNF exercises for the lower limbs with total duration 10 minutes (PNF) while the other 12 swimmers (6 boys-6 girls) were the control group (C) following only the swimming workout. Leg’s range of motion measured with electrical goniometer and performance evaluation test included 10 seconds, 2 and 10 minutes freestyle kick at maximum intensity with kickboard. The distance that were covered, the number of kicks and the blood lactate concentration, three minutes after the effort, were measured. The test protocol was carried out at the begging, the 4th and the 8th week of investigation. The statistical analysis did not reveal a significant effect of PNF at leg mobility. The performance improved the same in both of groups (PNF, C). In conclusion, the use of distending stretching (PNF) did not affect positive or negative at the parameters that we study.