1. Introduction
A growing body of research is focused on core stability training (CST). Core stability refers to an effective recruitment of core muscles (including the abdominal, back, pelvic, and hip muscles) leading to an optimal production of force and precise control of lumbopelvic-hip movement, as well as appropriate load transfer from the spine to the pelvis and distal segments. As such, it is thought to be a determinant factor for effective motor performance. In support of this notion, weak or fatigued core muscles are associated with suboptimal tennis strokes, altered cycling mechanics, and increased incidence of non-contact anterior cruciate ligamentous and hamstring injuries. Furthermore, preliminary evidence shows that CST reduces injury rate and enhances performance in elite athletes and improves shortterm rehabilitation outcome in individuals with musculoskeletal problems.