The core is essential for balance, power, stability, twisting, swinging, reaching, lifting and speed. The FreeMotion s5.6 coordinates your lower body and your upper body to work simultaneously to fire core muscles. This Core-Vantage push-pull movement strengthens your abs, obliques and back - the entire core. This helps keep your core lean. Because carrying that extra weight around your middle is a proven health risk, and the FreeMotion with Core-Vantage is a great way to reduce that risk.