Real life conditions require concurrent attention-demanding tasks, increasing the risk of falling and contributing to disability. Pilates-based exercise is proposed as a combined core and mental training program grounded on learning functionally effective postural sets and motor patterns, that will provide better results than a muscular exercise program in old women trunk strength, the risk of falling, functional autonomy and other complementary physical and mental functions. This is a 34-weeks cluster randomized controlled trial in which 80 independent old women will be allocated to a Pilates-based exercise program, a muscular exercise program, and a no-exercise control group. The intervention is divided into 22 weeks of supervised exercise and a 12 weeks follow-up. Primary outcome will be isokinetic and isometric trunk and hip flexion-extension strength, static and dynamic balance, the number of falls, and functional autonomy. Secondary outcome will include body composition, habitual physical activity and a standardized gerontological evaluation composed of body composition, daily physical activity, the independence to develop basic and instrumental activities of daily living, and the cognitive, affective and social function assessment. Every item will be measured at baseline, 22 and 34 weeks.