In the recent years, Pilates exercises have attracted the researchers as a corrective exercise with the idea of improving the postural abnormalities. It's believed that Pilates exercises can improve balance and posture. For the proof of this claim, we are following the investigation of Pilate's exercises effects on the lumbar hyperlordosis in 15- 18 years old girl students. So 27 girls with hyperlordosis whom the degree of their lumbar lordosis was one SD above the mean of pilot study (39.05+11.05=50.10) were selected. To gather the data, the flexible ruler was used to measure the lumbar lordosis. Sit-up test was used to measure the local endurance of abdominal muscles and sit and reach test to measure the flexibility of low back muscles. The exercise protocol was performed for eight weeks, three sessions per week and one hour per session. Measuring of variables was performed before (pre-test) and after (posttest) the protocol. To compare the means, paired sample t test was used before and after the exercise protocol. Based on the results, the lumbar lordosis degree in the 15-18 yr. girls significantly decreased after eight weeks (t =7.36, p≤0.05). There was a significantly increase in the local endurance of abdominal muscles (t =-8.18, p≤0.05) also flexibility of low back muscles (t =-9.86, p≤0.05). So, it is concluded that Pilates exercises could have a potential role to improve the students postural abnormalities and it is useful to perform this exercise at schools
