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Objectives Low back pain affects the person's ability to keep balance, especially in challenging conditions. The purpose of this study was to determine the immediate effects of Pilates exercises on postural sway and dynamic balance of young individuals with non-specific low back pain. Design Controlled laboratory design. Settings and main outcome measures Forty-six participants with non-specific low back pain were randomized to a Pilates (n = 23, 10 males; age: 21.8 ± 3.2 years) and a control group (n = 23, 9 males; age: 22.8 ± 3.6 years). Postural sway was assessed with a force platform and dynamic balance with the Star Excursion Balance Test, before and after the intervention or rest period. To assess postural sway, participants stood still on an unstable surface set on the force plate for 90s, with eyes closed. Intervention The intervention lasted 20 min and consisted on four Pilates exercises: single leg stretch (level 1), pelvic press (level 1), swimming (level 1) and kneeling opposite arm and leg reach. Results At baseline, no differences were found between groups. The Pilates group improved in all the postural sway values (area of CoP: 11.5 ± 3.4 to 9.7 ± 2.7 cm2, p = 0.002 and CoP velocity: 2.8 ± 0.6 to 2.3 ± 0.5 cm/s, p Conclusions Pilates exercises immediately improved postural sway and dynamic balance in young adults with non-specific low back pain.