A device for practicing an address stance and ball-hitting motion in sports such as baseball, softball and tennis. A hitter stands on a step plate (30) and a swivel plate (31) mounted on a flat base (12). The plates have adjustable separation, with the step plate fixable in a plurality of locations relative to the swivel plate. The plates align the hitter's feet using toe stops (36). The step plate (30) has a foot guard (34) that forces the hitter to step toward the pitch. The swivel plate (31) rotates about a vertical axis, and has foot-retaining straps (38, 39) that allow the heel to lift. The hitter learns to step toward the ball and swivel the back foot while swinging, turning the body, and shifting weight toward the ball. The foot plates (30, 31) are reversible on the base (12) for right or left-handed use.